JSFiddle - React, Tailwind, and code Playground

HTML

<div class="fix">
  <div class="line"></div>
  <span>1</span><span>2</span><span>3</span>
</div>
<div class="content">
  <br>
  content
</div>

CSS

html,body{margin:0;background:#fff;}
.fix{position:fixed;width:100%;height:1.2em;z-index:2;text-align:center;}
.fix .line{position:relative;top:50%;border-bottom:1px solid #900;z-index:-1;}
.fix span{display:inline-block;background:#fff;margin:0 10px;}
.content{width:110%;}