JSFiddle - React, Tailwind, and code Playground

HTML

<input class="txt" type="text" name="name">
<button class="btn">Submit</button>

CSS

body{
 background-color: red;
}


.txt {
  display: inline-block;
  width: 80%;
  font-size: 2em;
  outline: none;
  padding: 15px;
  margin:0;
}

.btn {
  display: inline-block;
  width: 20%;
  margin:0;
}