JSFiddle - React, Tailwind, and code Playground

HTML

<div class="a">Techolay Sosyal</div>
<div class="b"></div>

CSS

body{
  height: 2000px;
}

.a{
  background: red;
}

.b{
  background: blue;
  height: 37px;
  position: sticky;
  top: 0;
}