1  box-sizing: content-box;
2  border-width: 8px;
3  border-style: solid;
4  border-image: linear-gradient(to right bottom, #260B3C, #a053df);
5  border-image-slice: 1;1.rounded-corners-gradient-borders {
2  width: 300px;
3  height: 80px;
4  border: double 4px transparent;
5  border-radius: 80px;
6  background-image: linear-gradient(white, white), radial-gradient(circle at top left, #f00,#3020ff);
7  background-origin: border-box;
8  background-clip: content-box, border-box;
9}1
2div{
3  width: 300px;
4  height: 80px;
5  border: double 5px transparent;
6  border-radius: 30px;
7  background-image: linear-gradient(white, white),         /*here must be*/
8                    linear-gradient(to right, green, gold);    /*both gradients*/
9  background-origin: border-box;
10  background-clip: content-box, border-box;
11}1div-border-and-content-background {
2  border-top: double 5px transparent;
3  
4  /* first gradient is for card background, second for border background */
5  background-image: linear-gradient(white,white), linear-gradient(to right, grey, black);
6  background-clip: padding-box, border-box;
7  background-origin: border-box;
8  }1@import url('//raw.githubusercontent.com/necolas/normalize.css/master/normalize.css');
2
3html {
4    /* just for showing that background doesn't need to be solid */
5    background: linear-gradient(to right, #DDD 0%, #FFF 50%, #DDD 100%);
6    padding: 10px;
7}
8
9.grounded-radiants {
10    position: relative;
11    border: 4px solid transparent;
12    border-radius: 16px;
13    background: linear-gradient(orange, violet);
14    background-clip: padding-box;
15    padding: 10px;
16    /* just to show box-shadow still works fine */
17    box-shadow: 0 3px 9px black, inset 0 0 9px white;
18}
19
20.grounded-radiants::after {
21    position: absolute;
22    top: -4px; bottom: -4px;
23    left: -4px; right: -4px;
24    background: linear-gradient(red, blue);
25    content: '';
26    z-index: -1;
27    border-radius: 16px;
28}
29<p class="grounded-radiants">
30    Some text is here.<br/>
31    There's even a line break!<br/>
32    so cool.
33</p>