There's a couple of things going on.
The transform functions als take a unit:
transform: rotateZ(180); -> transform:rotateZ(180deg);
The transition from height:auto; isn't intuitively supported.
There's a couple of work arounds. You could find exmaples on this question
Sidenote: Generally, transitioning on width/height is bad practice for performance. It will trigger a reflow/recalculate of the document structure. which is costly.
You would also notice that the text inside the divs gets squished into multiple lines or moves around a lot.
general approach is to use transform to shrink/grow/fold-out the elements. like you did for rotate.
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
body {
font-family: "Arial", sans-serif;
}
.container {
padding: 10px;
margin-left: 20px;
}
.container > *[class*="bg"] {
margin-left: 10px;
}
.bg-gray {
margin: 10px 0px;
background-color: #cbd5e0;
border: 3px solid black;
padding: 20px;
margin-bottom: 20px;
width: 30%;
}
#tr-w {
transition: width 1s ease-in-out;
}
#tr-w:hover {
width: 50%;
}
#tr-h {
transition: height 1s ease-in-out;
height:100px; /*I've added a base heigth to so the browser can calculate a starting value */
}
#tr-h:hover {
height: 40vh;
}
#tr-r {
transition: transform 1s ease-in-out;
}
#tr-r:hover {
transform: rotateZ(180deg); /*i've added a 'deg' as unit*/
}
<!DOCTYPE html>
<html lang="en" dir="ltr">
<head>
<meta charset="utf-8" />
<title>Transition Animation CC</title>
<link rel="stylesheet" href="style.css" />
</head>
<body>
<div class="container">
<div class="bg-gray" id="tr-w">
<p>
Hover over me
</p>
</div>
<div class="bg-gray" id="tr-h">
<p>
Hover over me
</p>
</div>
<div class="bg-gray" style="height: 30vh;" id="tr-r">
<p>
Hover over me
</p>
</div>
</div>
<script src="main.js" charset="utf-8"></script>
</body>
</html>
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