JSFiddle - React, Tailwind, and code Playground

by Qwerty_Wasd

HTML

<div class="general">
	<div class="right">
		<div class="top"></div>
		<div class="bottom">
			<textarea name="text" id="text"></textarea>
		</div>
	</div>
</div>

CSS

html, body {
  height: 100%;
  overflow: hidden;
}
body {
  margin: 0;
  padding: 0;
  border: 0;
  outline: 0;
}

*, *:after, *:before {
  box-sizing: border-box;
}

.general {
  display: flex;
  flex-wrap: nowrap;
  justify-content: space-between;
  align-items: stretch;
  height: 100%;
}
.right {
  display: flex;
  flex-direction: column;
  background-color: #ccc;
  flex-grow: 1;
}
.top {
  height: 30px;
  background-color: #d0d;
}
.bottom {
  height: 100%;
  flex-grow: 1;
}
textarea {
  width: 100%;
  height: 100%;
}