JSFiddle - React, Tailwind, and code Playground

HTML

<body ng-app>

    <!-- Add your site or application content here -->
    <!-- ngView:  --><div class="container" ng-view=""><section id="login-section">
    <h1 class="login-heading">Sign in</h1>
    <form class="login-form" action="" method="POST">
        <div class="user-inputs">
            <input ng-model="username" ng-class="{'has-input': username.length > 0}" autocomplete="off" placeholder="Username" type="text" name="user_session[username]" tabindex="1">
            <input ng-model="password" ng-class="{'has-input': password.length > 0}" placeholder="Password" type="password" name="user_session[password]" tabindex="2">
        </div>
        <input type="hidden" name="token">
        <input type="submit" name="commit" value="Sign in">
    </form>
    <div class="increase asd">+</div>
    <div class="decrease asd">-</div>
</section></div>
    

</body></html>

CSS

/* http://meyerweb.com/eric/tools/css/reset/ 
   v2.0 | 20110126
   License: none (public domain)
*/

html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed, 
figure, figcaption, footer, header, hgroup, 
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
	margin: 0;
	padding: 0;
	border: 0;
	font-size: 100%;
	font: inherit;
	vertical-align: baseline;
    
}
/* HTML5 display-role reset for older browsers */
article, aside, details, figcaption, figure, 
footer, header, hgroup, menu, nav, section {
	display: block;
}
body {
	line-height: 1;
}
ol, ul {
	list-style: none;
}
blockquote, q {
	quotes: none;
}
blockquote:before, blockquote:after,
q:before, q:after {
	content: '';
	content: none;
}
table {
	border-collapse: collapse;
	border-spacing: 0;
}


input, input[type="password"], input[type="search"], isindex
{
    border:0;
    border-bottom:10px solid #000;
    
}
html
{
    border:0px;
}

.asd {
  cursor: pointer;
  margin-top: 10px;
  background: #ccc;
  padding: 2px;
}
.asd.increase:before {
  content: 'Increase margin of .user-inputs  ';
}
.asd.decrease:before {
  content: 'Decrease margin of .user-inputs ';
}

html, body, .container {
  height: 100%;
}

body {
  background: #eee;
  font-family: 'Lato', sans-serif;
  font-size: 1.3em;
  border:0px;
}

#login-section {
  width: 500px;
  margin: 0 auto;
  padding: 15px 50px 40px;
  position: relative;
  top: 50%;
  background: #e7e7e7;
  border: 1px solid #ddd;
  -moz-transform: translateY(-50%);
  -ms-transform: translateY(-50%);
  -webkit-transform: translateY(-50%);
  transform: translateY(-50%);
}
#login-section .logo {
  position: absolute;
  width: 70px;
  bottom: 5px;
...

JavaScript

$(function() {
  $('.asd').hover(function() {
    $('.user-inputs').css({'background': '#e1e1e1'});

  }, function() {
    $('.user-inputs').css({'background': 'transparent'});
  });
  
  $('.increase').on('click', function() {
    var curMargin = parseInt($('.user-inputs').css('margin-bottom'));
    curMargin++;
    $('.user-inputs').css({'margin-bottom': curMargin});
  });
  
    $('.decrease').on('click', function() {
    var curMargin = parseInt($('.user-inputs').css('margin-bottom'));
    curMargin--;
    $('.user-inputs').css({'margin-bottom': curMargin});
  });
});