308 lines
9.2 KiB
CSS
308 lines
9.2 KiB
CSS
/*
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Now here is when interesting things start to appear.
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We set up <body> styles with default font and nice gradient in the background.
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And yes, there is a lot of repetition there because of -prefixes but we don't
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want to leave anybody behind.
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*/
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body {
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font-family: 'PT Sans', sans-serif;
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min-height: 740px;
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background: rgb(215, 215, 215);
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background: -webkit-gradient(radial, 50% 50%, 0, 50% 50%, 500, from(rgb(240, 240, 240)), to(rgb(190, 190, 190)));
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background: -webkit-radial-gradient(rgb(240, 240, 240), rgb(190, 190, 190));
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background: -moz-radial-gradient(rgb(240, 240, 240), rgb(190, 190, 190));
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background: -ms-radial-gradient(rgb(240, 240, 240), rgb(190, 190, 190));
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background: -o-radial-gradient(rgb(240, 240, 240), rgb(190, 190, 190));
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background: radial-gradient(rgb(240, 240, 240), rgb(190, 190, 190));
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}
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/*
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Because the main point behind the impress.js demo is to demo impress.js
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we display a fallback message for users with browsers that don't support
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all the features required by it.
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All of the content will be still fully accessible for them, but I want
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them to know that they are missing something - that's what the demo is
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about, isn't it?
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And then we hide the message, when support is detected in the browser.
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*/
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.fallback-message {
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font-family: sans-serif;
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line-height: 1.3;
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width: 780px;
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padding: 10px 10px 0;
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margin: 20px auto;
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border: 1px solid #E4C652;
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border-radius: 10px;
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background: #EEDC94;
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}
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.fallback-message p {
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margin-bottom: 10px;
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}
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.impress-supported .fallback-message {
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display: none;
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}
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/*
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Now let's style the presentation steps.
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We start with basics to make sure it displays correctly in everywhere ...
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*/
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.step {
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position: relative;
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width: 900px;
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padding: 40px;
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margin: 20px auto;
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-webkit-box-sizing: border-box;
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-moz-box-sizing: border-box;
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-ms-box-sizing: border-box;
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-o-box-sizing: border-box;
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box-sizing: border-box;
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font-family: 'PT Serif', georgia, serif;
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font-size: 48px;
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line-height: 1.5;
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}
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/*
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... and we enhance the styles for impress.js.
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Basically we remove the margin and make inactive steps a little bit transparent.
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*/
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.impress-enabled .step {
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margin: 0;
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opacity: 0.3;
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-webkit-transition: opacity 1s;
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-moz-transition: opacity 1s;
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-ms-transition: opacity 1s;
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-o-transition: opacity 1s;
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transition: opacity 1s;
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}
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.impress-enabled .step.active { opacity: 1 }
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/*
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These 'slide' step styles were heavily inspired by HTML5 Slides:
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http://html5slides.googlecode.com/svn/trunk/styles.css
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;)
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They cover everything what you see on first three steps of the demo.
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All impress.js steps are wrapped inside a div element of 0 size! This means that relative
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values for width and height (example: `width: 100%`) will not work. You need to use pixel
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values. The pixel values used here correspond to the data-width and data-height given to the
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#impress root element. When the presentation is viewed on a larger or smaller screen, impress.js
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will automatically scale the steps to fit the screen.
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*/
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.slide {
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display: block;
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width: 900px;
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height: 700px;
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padding: 40px 60px;
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background-color: white;
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border: 1px solid rgba(0, 0, 0, .3);
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border-radius: 10px;
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box-shadow: 0 2px 6px rgba(0, 0, 0, .1);
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color: rgb(102, 102, 102);
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text-shadow: 0 2px 2px rgba(0, 0, 0, .1);
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font-family: 'Open Sans', Arial, sans-serif;
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font-size: 30px;
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line-height: 36px;
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letter-spacing: -1px;
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}
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.slide q {
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display: block;
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font-size: 50px;
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line-height: 72px;
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margin-top: 100px;
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}
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.slide q strong {
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white-space: nowrap;
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}
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/*
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The last step is an overview.
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There is no content in it, so we make sure it's not visible because we want
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to be able to click on other steps.
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*/
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#overview { display: none }
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/*
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We also make other steps visible and give them a pointer cursor using the
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`impress-on-` class.
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*/
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.impress-on-overview .step {
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opacity: 1;
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cursor: pointer;
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}
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/*
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Now, when we have all the steps styled let's give users a hint how to navigate
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around the presentation.
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The best way to do this would be to use JavaScript, show a delayed hint for a
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first time users, then hide it and store a status in cookie or localStorage...
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But I wanted to have some CSS fun and avoid additional scripting...
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Let me explain it first, so maybe the transition magic will be more readable
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when you read the code.
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First of all I wanted the hint to appear only when user is idle for a while.
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You can't detect the 'idle' state in CSS, but I delayed a appearing of the
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hint by 5s using transition-delay.
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You also can't detect in CSS if the user is a first-time visitor, so I had to
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make an assumption that I'll only show the hint on the first step. And when
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the step is changed hide the hint, because I can assume that user already
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knows how to navigate.
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To summarize it - hint is shown when the user is on the first step for longer
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than 5 seconds.
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The other problem I had was caused by the fact that I wanted the hint to fade
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in and out. It can be easily achieved by transitioning the opacity property.
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But that also meant that the hint was always on the screen, even if totally
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transparent. It covered part of the screen and you couldn't correctly clicked
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through it.
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Unfortunately you cannot transition between display `block` and `none` in pure
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CSS, so I needed a way to not only fade out the hint but also move it out of
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the screen.
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I solved this problem by positioning the hint below the bottom of the screen
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with CSS transform and moving it up to show it. But I also didn't want this move
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to be visible. I wanted the hint only to fade in and out visually, so I delayed
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the fade in transition, so it starts when the hint is already in its correct
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position on the screen.
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I know, it sounds complicated ... maybe it would be easier with the code?
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*/
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.hint {
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/*
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We hide the hint until presentation is started and from browsers not supporting
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impress.js, as they will have a linear scrollable view ...
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*/
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display: none;
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/*
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... and give it some fixed position and nice styles.
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*/
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position: fixed;
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left: 0;
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right: 0;
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bottom: 200px;
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background: rgba(0,0,0,0.5);
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color: #EEE;
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text-align: center;
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font-size: 50px;
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padding: 20px;
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z-index: 100;
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/*
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By default we don't want the hint to be visible, so we make it transparent ...
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*/
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opacity: 0;
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/*
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... and position it below the bottom of the screen (relative to it's fixed position)
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*/
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-webkit-transform: translateY(400px);
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-moz-transform: translateY(400px);
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-ms-transform: translateY(400px);
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-o-transform: translateY(400px);
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transform: translateY(400px);
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/*
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Now let's imagine that the hint is visible and we want to fade it out and move out
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of the screen.
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So we define the transition on the opacity property with 1s duration and another
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transition on transform property delayed by 1s so it will happen after the fade out
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on opacity finished.
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This way user will not see the hint moving down.
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*/
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-webkit-transition: opacity 1s, -webkit-transform 0.5s 1s;
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-moz-transition: opacity 1s, -moz-transform 0.5s 1s;
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-ms-transition: opacity 1s, -ms-transform 0.5s 1s;
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-o-transition: opacity 1s, -o-transform 0.5s 1s;
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transition: opacity 1s, transform 0.5s 1s;
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}
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/*
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Now we 'enable' the hint when presentation is initialized ...
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*/
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.impress-enabled .hint { display: block }
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/*
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... and we will show it when the first step (with id 'bored') is active.
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*/
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.impress-on-bored .hint {
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/*
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We remove the transparency and position the hint in its default fixed
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position.
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*/
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opacity: 1;
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-webkit-transform: translateY(0px);
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-moz-transform: translateY(0px);
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-ms-transform: translateY(0px);
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-o-transform: translateY(0px);
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transform: translateY(0px);
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/*
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Now for fade in transition we have the oposite situation from the one
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above.
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First after 4.5s delay we animate the transform property to move the hint
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into its correct position and after that we fade it in with opacity
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transition.
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*/
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-webkit-transition: opacity 1s 5s, -webkit-transform 0.5s 4.5s;
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-moz-transition: opacity 1s 5s, -moz-transform 0.5s 4.5s;
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-ms-transition: opacity 1s 5s, -ms-transform 0.5s 4.5s;
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-o-transition: opacity 1s 5s, -o-transform 0.5s 4.5s;
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transition: opacity 1s 5s, transform 0.5s 4.5s;
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}
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/*
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Custom for Chamilo LMS.
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*/
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.impress-enabled #impress-toolbar {
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pointer-events: auto;
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font: 11pt sans-serif;
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position: fixed;
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bottom: 0;
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right: 50%;
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-webkit-transform: translateX(50%);
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-moz-transform: translateX(50%);
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-ms-transform: translateX(50%);
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-o-transform: translateX(50%);
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transform: translateX(50%);
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}
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