<style> rainborder { border: 3px solid; border-image-slice: 1; border-image-source: linear-gradient(to bottom right, #b827fc 0%, #2c90fc 25%, #b8fd33 50%, #fec837 75%, #fd1892 100%); height: 10em; width: 15em; padding: .5em; } </style> <div id="rainborder"> This is the rainbow border container for