JSFiddle - React, Tailwind, and code Playground

HTML

<div>
<div class="background">

</div>
</div>

CSS

.background {
    position: absolute;
    display: block;
    width: 50%;
    height: 50%;
    border-radius: 10px;
    border-style: solid;
    border-width: 2px;
    border-image-source: linear-gradient(to bottom, #becaff 0%, #4514b7 98%);
    border-image-slice: 1;
    background-image: linear-gradient(to bottom, #edf4ff 70%, #c2d2f0), linear-gradient(to bottom, #becaff 0%, #4514b7 98%);
    background-origin: border-box;
    background-clip: content-box, border-box;
}