HTML
<div class="scale"></div>
CSS
.scale {
width: 100px;
height: 100px;
background: teal;
transform: scale(0.5, 1.3);
}
This example will scale the div to 100px * 0.5 = 50px
on the X axis and to 100px * 1.3 = 130px
on the Y axis.
The center of the transform is in the center of the div, 50%
from left and 50%
from top.