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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
  <div id="triangle-topleft"></div>
</body>
</html>
 
#triangle-topleft {
  position: relative;
  width: 0;
  height: 0;
  border-top: 300px solid blue;
  border-right: 100px solid transparent;
}
​
#triangle-topleft::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 0;
  border-top: 300px solid red;
  border-right: 100px solid transparent;
  transform: translate(5px, -100%);
  z-index: -1;
}
​
#triangle-topleft::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 5px;
  height: 15px;
  background-color: red;
  z-index: -1;
}
​
​
Output 300px

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