Why Are My CSS Pseudo-Element Triangles the Wrong Shape?

Creating HTML/CSS Triangles with Pseudo Elements

While attempting to create a triangle shape using pseudo elements, you encounter an incorrect output. You observe an unwanted shape rather than the desired one.

To address this issue, it's crucial to understand the root cause related to the use of borders. Refer to the provided link on how CSS triangles work, and you'll gain a deeper understanding of border behavior and its impact on the output.

An alternative solution that effectively creates a triangle involves employing rotation and borders. Here's how:

.box {
  border: 1px solid;
  margin: 50px;
  height: 50px;
  position: relative;
  background: #f2f2f5;
}

.box:before {
  content: "";
  position: absolute;
  width: 20px;
  height: 20px;
  border-top: 1px solid;
  border-left: 1px solid;
  top: -11px;
  left: 13px;
  background: #f2f2f5;
  transform: rotate(45deg);
}

<div class="box"></div>

This approach combines a rotated pseudo element with borders to produce the desired triangle shape. The specified rotation angle determines the triangle's orientation.

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