How to Create a Perfect CSS Triangle Using Pseudo-elements?

CSS Triangular Shape with Pseudo Elements

In an attempt to replicate a triangular shape using pseudo elements, one may encounter difficulties as demonstrated in the provided screenshots. To resolve this, let's explore alternative approaches.

The original code utilized borders to create the triangle. However, borders are not ideal for this purpose due to their inherent properties. Instead, a combination of rotation and borders can yield more accurate results.

The following code snippet offers a solution:

.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);
}

This code positions the pseudo element as desired, utilizing rotation to create the triangular shape. The border properties ensure the accuracy of the shape's dimensions.

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