Question

I am not good in math and geometry, so I would love if someone could help me with creating the following shape:

So basically the shape exists out of 3 rectangles, I got the first two working perfect with transform matrix, but I can’t get the last one to match the shape (see link above for img)

JSFiddle, what I tried so far or see code below

HTML

<div class="shape">
  <div class="shape-rect-one"></div>
  <div class="shape-rect-two"></div>
  <div class="shape-rect-three"></div>
</div>​

CSS

.shape {
  perspective: 1000px;
}

.shape div {
  width: 100px;
  height: 100px;
  opacity: 0.4;
  background-color: #333;
}

.shape-rect-one {
  z-index: 100;

  transform: matrix(1, -0.40, 0, 1, 0, 0);
  -webkit-transform: matrix(1, -0.40, 0, 1, 0, 0);
}

.shape-rect-two {
  z-index: 200;

  transform: matrix(1, -0.40, 0, 1, 0, 0);
  -webkit-transform: matrix(1, 0.40, 0, 1, 0, 0);
}

.shape-rect-three {
  z-index: 300;
}​

Answer 1

This should create the diamond shape.

transform: matrix(-0.965, 0.45, -0.965, -0.45, 0, 0);
-webkit-transform: matrix(-0.965, 0.45, -0.965, -0.45, 0, 0);