How Can I Create Angled Corners with Preserved Borders Using Pure CSS?

CSS Angled Corners: A Deep Dive

Creating angled corners using pure CSS can be a challenging task, especially when it comes to preserving the border. However, with careful manipulation of :before and :after elements, it is possible to achieve a close approximation.

Step 1: Container with Border

Begin by adding a border to the container that holds the desired angled shape.

Step 2: :before for Corner Blackout

Next, create a :before element to block out a specific corner. To ensure it covers the border, offset it by -1px.

Step 3: :after for Inner Line

For the angled line within the cut-off corner, introduce an :after element. Offset this slightly from the :before element.

Example Code:

.cutCorner {
  position: relative;
  background-color: blue;
  border: 1px solid silver;
  display: inline-block;
}
.cutCorner img {
  display: block;
}
.cutCorner:before {
  position: absolute;
  left: -1px;
  top: -1px;
  content: '';
  border-top: 70px solid silver;
  border-right: 70px solid transparent;
}
.cutCorner:after {
  position: absolute;
  left: -2px;
  top: -2px;
  content: '';
  border-top: 70px solid white;
  border-right: 70px solid transparent;
}

As noted in the solution, maintaining the thickness of the 45-degree line can be an issue. However, this approach provides a workable solution for creating angled corners with a border.

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