Craft a CSS triangle shape from scratch

Looking at the image of a blue triangle, I am curious about how to recreate it using CSS. Would using a background image be the best approach, or is there a way to achieve this with CSS transforms? I noticed the triangle is on the left side but not on the right, so making it responsive will be essential.

Thank you!

Answer №1

To construct the lower part, I utilized a single div along with its after pseudo element.

For more details, check out: http://codepen.io/magnus16/pen/anksv

Another option that may be preferable is using a single element without any pseudo elements needed:

.trapz{
  position:absolute;
   height: 50px; 
   width: 0px;
  background-color:transparent;
   border-left: 500px solid blue;
   border-bottom: 30px solid transparent;
}

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