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<title>Keynote Slides with Pure CSS</title>
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<h1>Keynote Slides with Pure CSS</h1>
<p>2020-06-22</p>
<p>There are a great deal of options available on the web and built into most operating systems when you need to create presentation / keynote slides. You could use native software like LibremOffice Impress, Powerpoint, Apple's Keynote, etc. You could also decide to use preexisting web-based apps like Google Slides or an open source project such as RevealJS. All of these are good options.</p>
<p>But thinking more about how overly complex these apps are implemented, it got me wondering if I could quickly code up a presentation slide framework with pure CSS and barely any code.</p>
<p>This is what I came up with:</p>
<h2>The Demo</h2>
<p><a href="https://codepen.io/bradleytaunt/pen/jOWBJZb">Live CodePen Example</a></p>
<p>Yes, I know this is <em>ugly</em>, but this was created as a barebones skeleton for others to build upon. The demo uses a simple set of <code>radio</code> inputs that correspond to their own individual <code>slide</code> element. The framework looks at the currently <code>checked</code> input, then changes the <code>opacity</code> and <code>z-index</code> of its corresponding slide item. Pretty straightforward stuff!</p>
<p>Let's break down each piece:</p>
<h2>The HTML</h2>
<pre><code><div class="slider">
<input type="radio" name="pagination" value="1" checked>
<input type="radio" name="pagination" value="2">
<input type="radio" name="pagination" value="3">
<input type="radio" name="pagination" value="4">
<input type="radio" name="pagination" value="5">
<div class="slide">
<h2>Slide 1</h2>
</div>
<div class="slide">
<h2>Slide 2</h2>
</div>
<div class="slide">
<h2>Slide 3</h2>
</div>
<div class="slide">
<h2>Slide 4</h2>
</div>
<div class="slide">
<h2>Slide 5</h2>
</div>
</div>
</code></pre>
<p>There isn't a whole lot going on here. We are just including a set of <code>radio</code> inputs (based on how many slides are desired) along with their corresponding <code>slide</code> class elements. You might notice we don't do anything to specifically target each individual slide item - you'll see why we don't need to in the CSS section!</p>
<h2>The CSS (SCSS)</h2>
<pre><code>/* Basic default styles */
.slider {
height: 100%;
left: 0;
position: fixed;
top: 0;
width: 100%;
.slide {
height: 100%;
opacity: 0;
position: absolute;
width: 100%;
z-index: -2;
}
}
input[type="radio"] { cursor: pointer; }
/* Target slide item based on currently checked radio */
input[type="radio"]:nth-of-type(1):checked ~ .slide:nth-of-type(1),
input[type="radio"]:nth-of-type(2):checked ~ .slide:nth-of-type(2),
input[type="radio"]:nth-of-type(3):checked ~ .slide:nth-of-type(3),
input[type="radio"]:nth-of-type(4):checked ~ .slide:nth-of-type(4),
input[type="radio"]:nth-of-type(5):checked ~ .slide:nth-of-type(5) {
opacity: 1;
z-index: 1;
}
/* Individual slide styling */
.slide:nth-of-type(1) { background: dodgerblue; }
.slide:nth-of-type(2) { background: crimson; }
.slide:nth-of-type(3) { background: rebeccapurple; }
.slide:nth-of-type(4) { background: goldenrod; }
.slide:nth-of-type(5) { background: pink; }
</code></pre>
<p>Again, not much to see here. We use CSS to look down through the DOM for each <code>radio</code> elements slide "partner". We do this by targeting the <code>nth-of-type</code> on both elements. Simple stuff.</p>
<p>Some drawbacks to this approach:</p>
<ul>
<li>You need to manually target each new slide you add (color, styling, content, etc.)</li>
<li>Lack of animations might require extra work to implement (maybe 3rd party libraries- ke AOS?)</li>
<li>Probably won't be best for extremely long/complex presentation slides</li>
</ul>
<p>That's it! Hope you enjoy playing around with it.</p>
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