JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://leaverou.github.com/prefixfree/prefixfree.min.js"></script>
<div id="zig_zag"></div>

CSS

#zig_zag {
    width: 140px;
    height: 5px;
    border-top:1px solid #E91010;
    background-repeat: repeat-x;
    background-position:10px 0;
    background-size: 7px 10px;
    background-image:
        linear-gradient(-45deg, #E91010 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #E91010 75%),
        linear-gradient(45deg, #E91010 25%, transparent 25%),
        linear-gradient(-45deg, transparent 75%, #E91010 75%);        
}