CodePen Embed - EqKKbb

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

.box {
  width: 100%;
  height: 90vh;
  border: 1px solid #FF6C60;
  background-size: 7px 7px;
  background-image: linear-gradient(
    -45deg,
    #fff, #fff 48.5%,
    #FF6C60 49.5%, #FF6C60 50.5%,
    #fff 51.5%, #fff
  );
}

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