Gradient Border

by Jeremy Bernier (https://twitter.com/jeremybernier)

by jbernier

HTML

<button class="gradient-border">Gradient Button</button>

CSS

body {
  background-color: hsl(0,0%,13%);
  color: white;
}

button {
  color: white;
  font-size: 48px;
}

.gradient-border {
  border-radius: 999px;
  padding: 10px 3rem;
  display: inline-block;
  position: relative;
  background: transparent;
  border: none;
}

.gradient-border::before {
  content: "";
  position: absolute;
  inset: 0;
  padding: 2px;
  border-radius: 9999px;
  background: linear-gradient(87.36deg, blue 6.42%, red 84.24%),
linear-gradient(0deg, #FFFFFF, #FFFFFF);
  -webkit-mask: 
     linear-gradient(#fff 0 0) content-box, 
     linear-gradient(#fff 0 0);
          mask: 
     linear-gradient(#fff 0 0) content-box, 
     linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
          mask-composite: exclude;
}