JSFiddle - React, Tailwind, and code Playground

HTML

<body>
  <div class="container">
    <section id="content">
      <form action="">
        <h1>Login</h1>
        <div>
          <input type="text" placeholder="Usuario" required="" id="username" />
        </div>
        <div>
          <input type="password" placeholder="Contraseña" required="" id="password" />
        </div>
        <div class="enter">
          <input type="submit" value="Entrar" />
        </div>
      </form>
      <!-- form -->

    </section>
    <!-- content -->
  </div>
  <!-- container -->

  <script src="js/index.js"></script>

</body>

CSS

body {
  background: #DCDDDF url(http://cssdeck.com/uploads/media/items/7/7AF2Qzt.png);
  color: #000;
  font: 14px Arial;
  margin: 0 auto;
  padding: 0;
  position: relative;
}

h1 {
  font-size: 28px;
}

h2 {
  font-size: 26px;
}

h3 {
  font-size: 18px;
}

h4 {
  font-size: 16px;
}

h5 {
  font-size: 14px;
}

h6 {
  font-size: 12px;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  color: #563D64;
}

small {
  font-size: 10px;
}

b,
strong {
  font-weight: bold;
}

a {
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.left {
  float: left;
}

.right {
  float: right;
}

.alignleft {
  float: left;
  margin-right: 15px;
}

.alignright {
  float: right;
  margin-left: 15px;
}

.clearfix:after,
form:after {
  content: ".";
  display: block;
  height: 0;
  clear: both;
  visibility: hidden;
}

.container {
  margin: 25px auto;
  position: relative;
  width: 900px;
}

#content {
  background: #f9f9f9;
  background: -moz-linear-gradient(top, rgba(248, 248, 248, 1) 0%, rgba(249, 249, 249, 1) 100%);
  background: -webkit-linear-gradient(top, rgba(248, 248, 248, 1) 0%, rgba(249, 249, 249, 1) 100%);
  background: -o-linear-gradient(top, rgba(248, 248, 248, 1) 0%, rgba(249, 249, 249, 1) 100%);
  background: -ms-linear-gradient(top, rgba(248, 248, 248, 1) 0%, rgba(249, 249, 249, 1) 100%);
  background: linear-gradient(top, rgba(248, 248, 248, 1) 0%, rgba(249, 249, 249, 1) 100%);
  filter: progid: DXImageTransform.Microsoft.gradient( startColorstr='#f8f8f8', endColorstr='#f9f9f9', GradientType=0);
  -webkit-box-shadow: 0 1px 0 #fff inset;
  -moz-box-shadow: 0 1px 0 #fff inset;
  -ms-box-shadow: 0 1px 0 #fff inset;
  -o-box-shadow: 0 1px 0 #fff inset;
  box-shadow: 0 1px 0 #fff inset;
  border: 1px solid #c4c6ca;
  margin: 0 auto;
  padding: 25px 0 0;
  position: relative;
  text-align: center;
  text-shadow: 0 1px 0 #fff;
  width: 400px;
}

#content h1 {
  color: #7E7E7E;
  font: bold 25px Helvetica, Arial, sans-serif;
  letter-spacing: -0.05em;
  line-height: 20px;
 ...