Creating a CSS double border line with a step in the middle

Question

I\'m trying to achieve this(Pic below) with strictly CSS and HTML for this header to be displayed on mobile devices. I was able to get it done, although I believe my way of

Answer 1

Double skewed border

Note Would recommend using SVG for this.

CSS:

• one element
• two pseudo elements

Used a lot of calc() with percentage values to get it to be fully responsive.
Used a lot of border-style double since this seemed like the easiest way render the borders.
The one element that is skewed is an absolute positioned element with a white background.
So you will probably need to to have a solid color background.

.extra-border {
  position: relative;
  border-bottom: 11px double black;
  border-top: 3px solid black;
  height: 150px;
  width: 100%;
  box-sizing: border-box;
}
.extra-border::before {
  content: "";
  position: absolute;
  display: inline-block;
  width: 50%;
  height: 15%;
  background-color: white;
  bottom: -11px;
  right: 0;
  border-top: 11px double black;
  border-bottom: 11px solid transparent;
}
.extra-border::after {
  content: "";
  position: absolute;
  display: inline-block;
  background-color: white;
  width: 20px;
  height: calc(20% + 19px);
  border-left: 13px double black;
  right: calc(50% - 11px);
  bottom: -20px;
  transform-origin: center center;
  transform: rotate(45deg);
}