How to style a triangle-shaped border with CSS transparency

I'm on a quest to create a border with a dynamic triangle effect. So far, I've managed to achieve a basic gradient effect, resulting in the following design:

Check out my current design in action

However, the background features a gradient that doesn't quite align with the border background.

Any suggestions on how I can perfect this effect? Keep in mind that the text may change based on screen size and content variations.

Appreciate any help you can offer! Thank you!

Answer №1

To create this effect, a clever technique involves utilizing pseudo-elements and the skewX attribute. By applying top, left, and right borders to the element and styling the before and after as the bottom left and right borders respectively, the desired look can be achieved:

body {
  background-color: white;
  background-image: linear-gradient(45deg, #999 25%, transparent 25%, transparent 75%, black 75%, black), linear-gradient(45deg, black 25%, transparent 25%, transparent 75%, #999 75%, #999);
  background-size: 10px 10px;
  background-position: 0 0, 50px 50px;
}

.dialog {
  text-align: center;
  color: green;
  font-size: 65px;
  width: 300px;
  height: 120px;
  background-color: transparent;
  border-width: 5px 5px 0 5px;
  border-color: red;
  border-style: solid;
  display: inline-block;
  position: relative;
}
.dialog:before {
  content: '';
  border-top: 5px solid red;
  border-right: 5px solid red;
  transform-origin: left top;
  transform: skewX(45deg);
  position: absolute;
  content: ' ';
  height: 10px;
  width: 46%;
  background: inherit;
  left: -5px;
  bottom: -10px;
}
.dialog:after {
  content: '';
  border-top: 5px solid red;
  border-left: 5px solid red;
  transform-origin: left top;
  transform: skewX(-45deg);
  position: absolute;
  content: ' ';
  height: 10px;
  width: 46%;
  background: inherit;
  right: -5px;
  bottom: -10px;
}
<div class="dialog">Here I am</div>

Answer №2

In order to accomplish this, you can use a background image, like the one shown in this example: .

In the example, the image is resized to only display a triangle shape using the following CSS:

.sprite-i-triangle {
background-position: 0 -1298px;
height: 44px;
width: 50px;
}

Make sure to choose an image that fits your needs, or explore other examples on this website: ()

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