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HTML

              
                <p>What you see below is a trapezoid creating by rotating a rectangle using CSS transform rules.</p>

<p>You can specify the value of each side of the trapezoid in the SCSS code and the exact transformations will be calculated and applied to generate this trapezoid.</p>

<div></div>
              
            
!

CSS

              
                @import 'compass/css3';

// Define the dimensions of the trapezoid below:

$side-long: 400px;
$side-short: 250px;
$side-vertical: 350px;

// This value is basically arbitrary, but to avoid edge cases that screw up the calculations it works generally better to keep it small.

$viewer-distance: 1px;

// The code below will calculate the transformations needed so that the rectangle becomes the trapezoid defined exactly by the values above.

$sin: $viewer-distance*($side-long - $side-short) / ($side-short*$side-vertical);

$angle: asin($sin);
$cos: cos($angle);
$factor: $side-vertical / ($side-vertical/2 + $viewer-distance*($side-vertical*$cos - $side-vertical/2) / ($viewer-distance + $side-vertical*$sin));

html, body {
  width: 100%;
  height: 100%;
  margin: 0;
}

body {
  display: flex;
  flex-direction: column;
}

p {
  margin: .5rem 1rem 0;
  max-width: 800px;
  text-align: left;
}

div {
  margin: auto;
  width: $side-long;
  height: $side-vertical;
  background-color: rgba(187, 187, 137, .25);
  position: relative;
  perspective: $viewer-distance;
  transform: scaleY($factor);
  transform-origin: bottom;
}

div:after {
  content: '';
  position: absolute;
  bottom: 0;
  width: 100%;
  height: 100%;
  background-color: hsl(45, 80%, 50%);
  transform: rotateX(#{$angle}rad);
  transform-origin: bottom;
}

              
            
!

JS

              
                
              
            
!
999px

Console