Here's a sneak peek of my current progress:
#expand {
height: 0px;
width: 0px;
overflow: hidden;
transition: height 0.5s, width 0.5s ease-in-out;
background: #000000;
color: #FFF;
}
input {
display: none;
visibility: hidden;
}
input:checked+label+#expand {
height: 150px;
width: 600px;
}
#toggle:checked~label::before {
content: "-";
}
/* unnecessary styling */
main {
background: #EEE;
width: 100px;
margin: 20px auto;
padding: 10px 0;
box-shadow: 0 3px 5px rgba(0, 0, 0, 0.3);
}
section {
padding: 0 20px;
}
label {
display: block;
padding: 0.5em;
text-align: center;
border-bottom: 1px solid #CCC;
color: #666;
}
label:hover {
color: #000;
}
label::before {
font-family: Consolas, monaco, monospace;
font-weight: bold;
font-size: 15px;
content: "+";
vertical-align: text-top;
display: inline-block;
width: 20px;
height: 20px;
margin-right: 3px;
background: radial-gradient(ellipse at center, #CCC 50%, transparent 50%);
}<main>
<input id="toggle" type="checkbox" />
<label for="toggle">Hidden Kitten</label>
<div id="expand">
<section>
<p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book.
It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with
desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.</p>
</section>
</div>
<input id="toggle1" type="checkbox" />
<label for="toggle1">Hidden Kitten</label>
<div id="expand">
<section>
<p>mew</p>
</section>
</div>
</main>In the input:checked + label + #expand selector, notice that the width and height are fixed.
I am able to set the width as a percentage without any issue, but attempting to set the height as a percentage disrupts the animation. How can I resolve this? Keep in mind that I do not know the text's height beforehand. My goal is to achieve this using CSS alone.