CSS: gardient border + border-radius -


is possible create gradient borders combined border radius?

i created button ::after element

button{     background: -webkit-gradient ... }  button::after{     content: '';     position: absolute;     height: calc(100% - 2px);     width: calc(100% - 2px);     left: 1px;     top: 1px;     background: rgba(16,20,28,1);     border-radius: 40px;     z-index: -1; }

which looks like:

ex1

the problem inner element should transparent. if background-color property of button set transparent, button takes on color (gardiet) of ::after element:

enter image description here

i have found following picture on internet inner body transparent , border gradient.

ex2

there multiple tricks such border these don't support border-radius.

a posibility, limited in support modern browsers (all major browser except ie) , limited colors can achieve, use mix-blend-mode, can make gray transparent.

also, special properties border, begin with

body {    background-color: lightgreen;  }    .test {    font-size: 30px;    border-radius: 1em;    border: solid 12px transparent;    width: 200px;    background: linear-gradient(gray,gray), linear-gradient(to right, red, blue);    background-clip: content-box, border-box;    background-origin: border-box;    mix-blend-mode: hard-light;  }
<div class="test">test</div>


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