gradient border

<style>
#scrollbox {
width: 300px;
height: 300px;
border: 2px solid;
border-image-slice: 1;
border-image-source: linear-gradient(to bottom right, #b827fc 0%, #2c90fc 25%, #b8fd33 50%, #fec837 75%, #fd1892 100%);
overflow: auto;
}
</style>
<div id="scrollbox">
text
</div>