Check out example codes for "rotate css". It will help you in understanding the concepts better.

Code Example 1

div {
  width: 80px;
  height: 80px;
  background-color: skyblue;
}

.tourne {
  transform: rotate(45deg); /* Équivalent à rotateZ(45deg) */
  background-color: pink;
}

Code Example 2

<style>
div {
  width: 80px;
  height: 80px;
  background-color: skyblue;
}
.rotated {
  transform: rotate(45deg);
  background-color: pink;
}
</style>

/* In body of html doc */
<div>Normal</div>
<div class="rotated">Rotated</div>

Code Example 3

div {
  position: absolute;
  left: 40px;
  top: 40px;
  width: 100px;
  height: 100px;
  background-color: lightgray;
}

.rotate {
  background-color: transparent;
  outline: 2px dashed;
  transform: rotate(45deg);
}

.rotate-translate {
  background-color: pink;
  transform: rotate(45deg) translateX(180px);
}

.translate-rotate {
  background-color: gold;
  transform: translateX(180px) rotate(45deg);
}

Code Example 4

div {
  width: 80px;
  height: 80px;
  background-color: skyblue;
}

.rotated {
  transform: rotate(45deg); /* Equal to rotateZ(45deg) */
  background-color: pink;
}

Code Example 5

<!DOCTYPE html>
<html>
<head>
<style> 
div.a {
  width: 150px;
  height: 80px;
  background-color: yellow;
  -ms-transform: rotate(20deg); /* IE 9 */
  transform: rotate(20deg);
}

div.b {
  width: 150px;
  height: 80px;
  background-color: yellow;
  -ms-transform: skewY(20deg); /* IE 9 */
  transform: skewY(20deg);
}

div.c {
  width: 150px;
  height: 80px;
  background-color: yellow;
  -ms-transform: scaleY(1.5); /* IE 9 */
  transform: scaleY(1.5);
}
</style>
</head>
<body>

<h1>The transform Property</h1>

<h2>transform: rotate(20deg):</h2>
<div class="a">Hello World!</div>
<br>

<h2>transform: skewY(20deg):</h2>
<div class="b">Hello World!</div>
<br>

<h2>transform: scaleY(1.5):</h2>
<div class="c">Hello World!</div>

</body>
</html>

Code Example 6

The following code will quadruples all the div elements-

  div {
  	transform: scale(4);
  }

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