JSFiddle - React, Tailwind, and code Playground

HTML

<p class="gradient-border">This is an example of a box with a gradient border. This example will currently work in Mozilla and Firefox browsers.</p>

CSS

.gradient-border {
    border: 8px solid #000;
    -moz-border-radius: 12px;
    -moz-border-bottom-colors: #555 #FF0000 #777 #888 #00FF00 #aaa #0000FF #ccc;
    -moz-border-top-colors:    #555 #FF0000 #777 #888 #00FF00 #aaa #0000FF #ccc;
    -moz-border-left-colors:   #555 #FF0000 #777 #888 #00FF00 #aaa #0000FF #ccc;
    -moz-border-right-colors:  #555 #FF0000 #777 #888 #00FF00 #aaa #0000FF #ccc;
    padding: 5px 5px 5px 15px;
}