How to Curve the hypotenuse of a triangle with CSS

Question

I would like to curve the hypotenuse side of this triangle div/background with CSS, so the result is something like this:

Not possible. You need to use SVG or canvas to draw that path. — Terry
– Terry, Commented Feb 22, 2021 at 8:49

Temani Afif · Accepted Answer · 2021-02-22 08:59:49Z

3

background can do it:

.box {
  width: 200px;
  height: 150px;
  background: radial-gradient(180% 180% at right -65% top -65%, transparent 99%, red )
}

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

edited Feb 22, 2021 at 8:59

answered Feb 22, 2021 at 8:53

Temani Afif

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Francesco · Accepted Answer · 2021-02-22 09:17:12Z

0

Another way of doing it, matching the background you are in with a pseudo :after covering the part you need :

Althogh I like more @Temani Afif answer above.

#curved-triangle::after {
    content: "";
    position: absolute;
    top: -100px;
    left: 0px;
    background: #fff;
    width: 200px;
    height: 200px;
    border-radius: 100%;
}
#curved-triangle {
    width: 0;
    height: 0;
    border-left: 0px solid transparent;
    border-right: 100px solid transparent;
    border-bottom: 100px solid red;
    position: relative;
}

  <div id="curved-triangle"></div>

answered Feb 22, 2021 at 9:17

Francesco

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