JSFiddle - React, Tailwind, and code Playground

HTML

<div class="loginForm">
    <input type=text>

CSS

.loginForm input[type='text']:focus, .loginForm input[type='password']:focus,
.registerForm input[type='text']:focus, .registerForm input[type='password']:focus{
    outline: 0;
    box-shadow: 0 0 10px gray;
    -webkit-box-shadow: 0 0 10px gray;
}