<ul id="login-widget-freebie">  
  <li>  
  <div class="login-widget">  
  <span id="login-widget-switch" class="button green">Вход</span>  
  <div id="login-widget-content">  
  <form method="post" action="#">  
  <input type="text" class="icon custom-input" style="background-image: url(images/username_field.png);" placeholder="Имя">  
  <input type="password" class="icon custom-input" style="background-image: url(images/password_field.png);" placeholder="Пароль">  
  <input type="submit" class="full big button pink" value="Войти">  
  </form>  
  </div>  
  </div>  
  </li>  
  </ul>

.button {  
  padding: 10px 15px;  
  font-size: 15px;  
  font-weight: bolder;  
  cursor: pointer;  
  border: 1px solid #000;  
  border-radius: 2px;  
  -moz-border-radius: 2px;  
  -webkit-border-radius: 2px;  
  text-shadow: 0 1px 0 rgba(0,0,0,0.4);  
}  

.button.big {  
  padding: 15px;  
  border-radius: 5px;  
  -moz-border-radius: 5px;  
  -webkit-border-radius: 5px;  
}  

span#login-widget-switch {  
  display: block;  
  width: 100px;  
  text-align: center;  
  margin: 0 auto;  
}  

div.login-widget {  
  position: relative;  
}  

div#login-widget-content {  
  position: absolute;  
  top: 80px;  
  left: 50%;  
  padding: 20px;  
  -webkit-box-shadow: 0px 0px 0px 5px rgba(255,255,255,0.11);  
  -moz-box-shadow: 0px 0px 0px 5px rgba(255,255,255,0.11);  
  box-shadow: 0px 0px 0px 5px rgba(255,255,255,0.11);  
  border-radius: 5px;  
  -moz-border-radius: 5px;  
  -webkit-border-radius: 5px;  
  width: 230px;  
  margin-left: -136px;  
  background-color: #ffffff;  
}  

input.custom-input {  
  margin-bottom: 20px;  
  padding: 10px;  
  padding-left: 60px;  
  border-radius: 5px;  
  -moz-border-radius: 5px;  
  -webkit-border-radius: 5px;  
  border: 1px solid #e0e0e0;  
  -webkit-box-shadow: inset 0px 3px 5px -4px rgba(0,0,0,0.1);  
  -moz-box-shadow: inset 0px 3px 5px -4px rgba(0,0,0,0.1);  
  box-shadow: inset 0px 3px 5px -4px rgba(0,0,0,0.1);  
  background: no-repeat 15px center;  
  background-color: #f4f4f4;  
}  

.button.pink {  
  background: rgba(233,151,152,1);  
  background: -moz-linear-gradient(top, rgba(233,151,152,1) 0%,rgba(219,99,99,1) 100%);  
  background: -webkit-gradient(left top, left bottom, color-stop(0%,rgba(233,151,152,1)), color-stop(100%, rgba(219,99,99,1)));  
  background: -webkit-linear-gradient(top, rgba(233,151,152,1) 0%,rgba(219,99,99,1) 100%);  
  background: -o-linear-gradient(top, rgba(233,151,152,1) 0%,rgba(219,99,99,1) 100%);  
  background: -ms-linear-gradient(top, rgba(233,151,152,1) 0%,rgba(219,99,99,1) 100%);  
  background: linear-gradient(to bottom, rgba(233,151,152,1) 0%,rgba(219,99,99,1) 100%);  
  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#e99798', endColorstr='#db6363', GradientType=0 );  
  -webkit-box-shadow: inset 0px 1px 0px 0px rgba(255,255,255,0.5), 0px1px 0px 0px rgba(0,0,0,0.21);  
  -moz-box-shadow: inset 0px 1px 0px 0px rgba(255,255,255,0.5), 0px1px 0px 0px rgba(0,0,0,0.21);  
  box-shadow: inset 0px 1px 0px 0px rgba(255,255,255,0.5), 0px 1px 0px0px rgba(0,0,0,0.21);  
  color: #fff;  
  border-color: #c75f5e;  
}  

.button.pink:hover {  
  background: rgba(233,151,152,1);  
  background: -moz-linear-gradient(top, rgba(233,151,152,1) 0%,rgba(240,120,120,1) 100%);  
  background: -webkit-gradient(left top, left bottom, color-stop(0%,rgba(233,151,152,1)), color-stop(100%, rgba(240,120,120,1)));  
  background: -webkit-linear-gradient(top, rgba(233,151,152,1) 0%,rgba(240,120,120,1) 100%);  
  background: -o-linear-gradient(top, rgba(233,151,152,1) 0%,rgba(240,120,120,1) 100%);  
  background: -ms-linear-gradient(top, rgba(233,151,152,1) 0%,rgba(240,120,120,1) 100%);  
  background: linear-gradient(to bottom, rgba(233,151,152,1) 0%,rgba(240,120,120,1) 100%);  
  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#e99798', endColorstr='#f07878', GradientType=0 );  
}  

.button.pink:active {  
  background: rgba(219,129,130,1);  
  background: -moz-linear-gradient(top, rgba(219,129,130,1) 0%,rgba(240,120,120,1) 100%);  
  background: -webkit-gradient(left top, left bottom, color-stop(0%,rgba(219,129,130,1)), color-stop(100%, rgba(240,120,120,1)));  
  background: -webkit-linear-gradient(top, rgba(219,129,130,1) 0%,rgba(240,120,120,1) 100%);  
  background: -o-linear-gradient(top, rgba(219,129,130,1) 0%,rgba(240,120,120,1) 100%);  
  background: -ms-linear-gradient(top, rgba(219,129,130,1) 0%,rgba(240,120,120,1) 100%);  
  background: linear-gradient(to bottom, rgba(219,129,130,1) 0%,rgba(240,120,120,1) 100%);  
  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#db8182', endColorstr='#f07878', GradientType=0 );  
}  

.button.green  
{  
  background: rgba(176,213,97,1);  
  background: -moz-linear-gradient(top, rgba(176,213,97,1) 0%,rgba(132,186,52,1) 100%);  
  background: -webkit-gradient(left top, left bottom, color-stop(0%,rgba(176,213,97,1)), color-stop(100%, rgba(132,186,52,1)));  
  background: -webkit-linear-gradient(top, rgba(176,213,97,1) 0%,rgba(132,186,52,1) 100%);  
  background: -o-linear-gradient(top, rgba(176,213,97,1) 0%,rgba(132,186,52,1) 100%);  
  background: -ms-linear-gradient(top, rgba(176,213,97,1) 0%,rgba(132,186,52,1) 100%);  
  background: linear-gradient(to bottom, rgba(176,213,97,1) 0%,rgba(132,186,52,1) 100%);  
  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#b0d561', endColorstr='#84ba34', GradientType=0 );  

  -webkit-box-shadow: inset 0px 1px 0px 0px rgba(255,255,255,0.5), 0px1px 0px 0px rgba(0,0,0,0.21);  
  -moz-box-shadow: inset 0px 1px 0px 0px rgba(255,255,255,0.5), 0px1px 0px 0px rgba(0,0,0,0.21);  
  box-shadow: inset 0px 1px 0px 0px rgba(255,255,255,0.5), 0px 1px 0px0px rgba(0,0,0,0.21);  

  color: #fff;  
  border-color: #598b06;  
}  

.button.green:hover  
{  
  background: rgba(176,213,97,1);  
  background: -moz-linear-gradient(top, rgba(176,213,97,1) 0%,rgba(152,214,58,1) 100%);  
  background: -webkit-gradient(left top, left bottom, color-stop(0%,rgba(176,213,97,1)), color-stop(100%, rgba(152,214,58,1)));  
  background: -webkit-linear-gradient(top, rgba(176,213,97,1) 0%,rgba(152,214,58,1) 100%);  
  background: -o-linear-gradient(top, rgba(176,213,97,1) 0%,rgba(152,214,58,1) 100%);  
  background: -ms-linear-gradient(top, rgba(176,213,97,1) 0%,rgba(152,214,58,1) 100%);  
  background: linear-gradient(to bottom, rgba(176,213,97,1) 0%,rgba(152,214,58,1) 100%);  
  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#b0d561', endColorstr='#98d63a', GradientType=0 );  
}  

.button.green:active  
{  
  background: rgba(162,199,84,1);  
  background: -moz-linear-gradient(top, rgba(162,199,84,1) 0%,rgba(152,214,58,1) 100%);  
  background: -webkit-gradient(left top, left bottom, color-stop(0%,rgba(162,199,84,1)), color-stop(100%, rgba(152,214,58,1)));  
  background: -webkit-linear-gradient(top, rgba(162,199,84,1) 0%,rgba(152,214,58,1) 100%);  
  background: -o-linear-gradient(top, rgba(162,199,84,1) 0%,rgba(152,214,58,1) 100%);  
  background: -ms-linear-gradient(top, rgba(162,199,84,1) 0%,rgba(152,214,58,1) 100%);  
  background: linear-gradient(to bottom, rgba(162,199,84,1) 0%,rgba(152,214,58,1) 100%);  
  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#a2c754', endColorstr='#98d63a', GradientType=0 );  
}  

div#login-widget-content::before  
{  
  content: '';  
  display: block;  
  position: absolute;  
  border: 16px solid #ffffff;  
  border-left: 16px solid rgba(255, 255, 255, 0);  
  border-right: 16px solid rgba(255, 255, 255, 0);  
  border-top: 0px solid rgba(255, 255, 255, 0);  
  top: -16px;  
  left: 50%;  
  margin-left: -16px;  
}  

div#login-widget-content::after  
{  
  content: '';  
  display: block;  
  position: absolute;  
  border: 19px solid rgba(255,255,255,0.11);  
  border-left: 18px solid rgba(255, 255, 255, 0);  
  border-right: 18px solid rgba(255, 255, 255, 0);  
  border-top: 0px solid rgba(255, 255, 255, 0);  
  top: -24px;  
  left: 50%;  
  margin-left: -18px;  
}

<script src="http://code.jquery.com/jquery-1.10.1.min.js"></script>  
  <script>  
  $(document).ready(function(){  
  $("#login-widget-switch").click(function(){  
  $("#login-widget-content").toggle();  
  });  
  });  
  </script>