JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <div class="header">
        header
    </div>
    <div class="scroll">
        <div>scroll</div>
        <div>scroll</div>
        <div>scroll</div>
        <div>scroll</div>
        <div>scroll</div>
        <div>scroll</div>
        <div>scroll</div>
        <div>scroll</div>
        <div>scroll</div>
        <div>scroll</div>
        <div>scroll</div>
    </div>
</div>

CSS

html {
  height: 100%;
}

body {
  display: flex;
  height: 100%;
  margin: 0;
}

.container {
    max-height: 150px;
    display: flex;
    flex-direction: column;
    width: 100%;
}

.header {
    height: 40px;
}

.scroll {
    flex: 1;
    overflow: auto;
}

div {
    border: 1px solid #DDD;
}