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                <div class="wrapper">
    This demonstrates how a border gradient
    can be applied to a single element using
    multiple backgrounds and specifying the
    background origin of each of those

<div class="wrapper wrapper--rounded">
    It gets a little weird when you want to 
    round the corners off. A pseudo element
    can be used to establish a clean rounded
    corner on the inside.
    You will need to tweak the dimmensions
    of the position, border, and radius to
    get things just right.


                .wrapper {
  box-sizing: border-box;
  margin: 1rem auto 2rem;
  padding: 1rem;
  width: 80%;
  max-width: 25rem;
  background: linear-gradient(#222, #222), 
              linear-gradient(to right, red, purple);
  border: 5px solid transparent;
  background-repeat: no-repeat;
  background-origin: padding-box, border-box;

.wrapper--rounded {
  border-radius: 1rem;
  border-width: 10px;
  position: relative;

.wrapper--rounded::before {
  content: "";
  position: absolute;
  top: -5px;
  bottom: -5px;
  left: -5px;
  right: -5px;
  border: 6px solid #222;
  border-radius: .8rem;

body {
  background: #222;  

p {
  font-family: sans-serif;
  color: whitesmoke;
  line-height: 1.4;