Css gradient border

  box-sizing: content-box;
  border-width: 8px;
  border-style: solid;
  border-image: linear-gradient(to right bottom, #260B3C, #a053df);
  border-image-slice: 1;

Source: anastasios-arvanitis.info

Linear gradient border

div-border-and-content-background {
  border-top: double 5px transparent;
  
  /* first gradient is for card background, second for border background */
  background-image: linear-gradient(white,white), linear-gradient(to right, grey, black);
  background-clip: padding-box, border-box;
  background-origin: border-box;
  }

Gradient border with border radius

.rounded-corners-gradient-borders {
  width: 300px;
  height: 80px;
  border: double 4px transparent;
  border-radius: 80px;
  background-image: linear-gradient(white, white), radial-gradient(circle at top left, #f00,#3020ff);
  background-origin: border-box;
  background-clip: content-box, border-box;
}

Rounded gradient border css

div{
  width: 300px;
  height: 80px;
  border: double 5px transparent;
  border-radius: 30px;
  background-image: linear-gradient(white, white),         /*here must be*/
                    linear-gradient(to right, green, gold);    /*both gradients*/
  background-origin: border-box;
  background-clip: content-box, border-box;
}

Source: stackoverflow.com

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