JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html lang="en">
<head>
  <title>Bootstrap Example</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>

  <style>
  .flexible{display: flex; flex-direction: row;}
  #row{
  background-color: lightblue;
  border-style: groove;
  }

  #form1{
  background-color: lightgreen;
  width: 50%;
  transition: width 0.75s ease;
  }

  #form1:hover{  
    width: 100%;
  }

  #form2{
  background-color: orange;
  width: 50%;
  transition: width 0.75s ease;
  }  

  #form2:hover{
  width: 100%;  
  }
  </style>


</head>
<body>

<div  class="container" >

  <div id="row" class="row flexible" >
    <div id="form1" class="col-sm-6">
    <!-- form1 -->
        <form class="form-horizontal">
  <div class="form-group">
    <label class="control-label col-sm-2" for="email">Email:</label>
    <div class="col-sm-10">
      <input type="email" class="form-control" id="email" placeholder="Enter email">
    </div>
  </div>
  <div class="form-group">
    <label class="control-label col-sm-2" for="pwd">Password:</label>
    <div class="col-sm-10"> 
      <input type="password" class="form-control" id="pwd" placeholder="Enter password">
    </div>
  </div>
  <div class="form-group"> 
    <div class="col-sm-offset-2 col-sm-10">
      <div class="checkbox">
        <label><input type="checkbox"> Remember me</label>
      </div>
    </div>
  </div>
  <div class="form-group"> 
    <div class="col-sm-offset-2 col-sm-10">
      <button type="submit" class="btn btn-default">Submit</button>
    </div>
  </div>
</form>
    </div>
    <div id="form2" class="col-sm-6">
    <!-- form 2 -->
        <form class="form-horizontal">
  <div...