css - Border Gradient with Border Radius

Question

I have the following CSS:-

a.btn.white-grad {
    background: $lgrey;
    color: #313149 !important;
    border: 1px solid #000;
    border-image-source: linear-gradient(to right, #9c20aa, #fb3570);
    border-image-slice: 20;
    float: left;
    @include font-size(26);
    margin: 75px 0;
}

Adding border-radius: 5px doesn't seem to do anything, I figured it's because I'm using border gradient, is there a way for me to achieve the desired 5px border radius at all?

Answer 1

2021: I recommend using the CSS mask version since the support is pretty good now

You cannot use border-radius with gradient. Here is another idea where you can rely on multiple background and adjust the background-clip:

.white-grad {
    background: 
     linear-gradient(#ccc,#ccc) padding-box, /*this is your grey background*/
     linear-gradient(to right, #9c20aa, #fb3570) border-box;
    color: #313149;
    padding:10px;
    border: 5px solid transparent;
    border-radius:15px;
    display:inline-block;
    margin: 75px 0;
}

<div class="white-grad"> Some text here</div>

<div class="white-grad"> Some long long long text here</div>

<div class="white-grad"> Some long long <br>long text here</div>