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CSS triangle

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It has become a habit, when I open some websites and see some intressting effects then naturally want to figure out how they did this. Tonight I came up with triangle again, just this time it is in practice.

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<div class="arrow-up"></div>
<div class="arrow-down"></div>
<div class="arrow-left"></div>
<div class="arrow-right"></div>
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.arrow-up {
  width: 0;
  height: 0;
  border-left: 20px solid transparent;
  border-right: 20px solid transparent;
  border-bottom: 20px solid black;
}

.arrow-down {
  width: 0;
  height: 0;
  border-left: 20px solid transparent;
  border-right: 20px solid transparent;
  border-top: 20px solid #f00;
}

.arrow-right {
  width: 0;
  height: 0;
  border-top: 20px solid transparent;
  border-bottom: 20px solid transparent;
  border-left: 20px solid green;
}

.arrow-left {
  width: 0;
  height: 0;
  border-top: 20px solid transparent;
  border-bottom: 20px solid transparent;
  border-right: 20px solid blue;
}
CSS triangle

This is the magic behind triangle.
border1
Then we set width: 0; height: 0
border2
Choose which piece you want to show, that's it.

Oh, forgot to say, what I bought is HDMI adapter.