<body class="login">
  <div class="container">
    <div class="login-container-wrapper clearfix">
      <ul class="switcher clearfix">
        <li class="first logo active" data-tab="login">         
            <a>Login</a>      
        </li>
        <li class="second logo" data-tab="sign_up">
            <a>Sign Up</a>  
        </li>
      </ul>
      <div class="tab-content">
        <div class="tab-pane active" id="login">
          <form class="form-horizontal login-form">
            <div class="form-group relative">
              <input class="form-control input-lg" id="login_username" placeholder="E-mail Address" required="" type="email"> <i class="fa fa-user"></i>
            </div>
            <div class="form-group relative">
              <input class="form-control input-lg" id="login_password" placeholder="Password" required="" type="password"> <i class="fa fa-lock"></i>
            </div>
            <div class="form-group">
              <button class="btn btn-success btn-lg btn-block" type="submit">Login</button>
            </div>
            <div class="checkbox checkbox-success">
              <input id="stay-sign" type="checkbox">
              <label for="stay-sign">Stay signed in</label>
            </div>
            <hr />
            <div class="text-center">
              <label><a href="#">Forgot your password?</a></label>
            </div>
          </form>
        </div>
        <div class="tab-pane" id="sign_up">
          <form class="form-horizontal login-form">
            <div class="form-group relative">
              <input class="form-control input-lg" id="login_username" placeholder="E-mail Address" required="" type="email"> <i class="fa fa-user"></i>
            </div>
            <div class="form-group relative">
              <input class="form-control input-lg" id="login_password" placeholder="Password" required="" type="password"> <i class="fa fa-lock"></i>
            </div>
            <div class="form-group relative">
              <input class="form-control input-lg" id="login_password" placeholder="Repeat Password" required="" type="password"> <i class="fa fa-lock"></i>
            </div>
            <div class="form-group">
              <button class="btn btn-success btn-lg btn-block" type="submit">Sign Up</button>
            </div>
            <div class="checkbox checkbox-success">
              <input id="agree-terms" type="checkbox">
              <label for="agree-terms"> Agree our terms</label>
            </div>
            <hr>
            <div class="text-center">
              <label><a href="#">Already Member?</a></label>
            </div>
          </form>
        </div>
      </div>
    </div>
  </div>
</body>
    @import url(https://fonts.googleapis.com/css?family=Varela);
.login{

}
html {
  height: 100%;
}
body {
  font-family: 'Varela', sans-serif;
  font-size: 14px;
  line-height: 1.5;
  color: #333;
  min-height: 100%;
  position: relative;
  width:100%;
  height:100%;
  overflow:hidden;
}
label {
  margin-bottom: 0;
}

a {
  color: #e1e1e1;
}

a:focus,
a:hover {
  color: #008080;
}

.checkbox-inline+.checkbox-inline,
.radio-inline+.radio-inline {
  margin-top: 6px;
}

body.login {
  background: rgba(255, 255, 255, 1);
}

.relative {
  position: relative;
}
.switcher{
  margin-bottom:70px;
}
ul.switcher li{
  list-style-type: none;
  width:50%;
  position:absolute;
  top:0;
}
.first{
  left:0;
}
.second{
  right:0;
}
.login-container-wrapper {
  max-width: 400px;
  margin: 2% auto 5%;
  padding: 40px;
  box-sizing: border-box;
  background: rgba(57, 89, 116, 0.8);
  position: relative;
  box-shadow: 0px 30px 60px -5px #000;
  background-image:url('https://images.unsplash.com/photo-1567359781514-3b964e2b04d6?ixlib=rb-1.2.1&q=85&fm=jpg&crop=entropy&cs=srgb&ixid=eyJhcHBfaWQiOjE0NTg5fQ');
  background-size:cover;
  background-blend-mode:saturation;
}
.login-container-wrapper .logo,
.login-container-wrapper .welcome {
  font-size: 16px;
  letter-spacing: 1px;
}
.login-container-wrapper li {
  text-align: center;
  padding:0 15px;
  background-color: #283443;
  height:50px;
  line-height:50px;
  box-shadow: inset 0 -2px 0 0 #ccc;
  cursor:pointer;
}
.login-container-wrapper li a{
   color:#fff;
}
.login-container-wrapper li a:hover{
  color:#ccc;
  text-decoration:none;
}

.login-container-wrapper li a:active,
.login-container-wrapper li a:focus{
  color:#fff;
  text-decoration:none;
}
.login-container-wrapper li.active{
  background-color:transparent;
  box-shadow:none;
}
.login-container-wrapper li.active a{
  border-bottom:2px solid #fff;
  padding-bottom:5px;
}

.login input:focus + .fa{
  color:#25a08d;
}
.login-form .form-group {
  margin-right: 0;
  margin-left: 0;
}

.login-form i {
  position: absolute;
  top: 0;
  left: 19px;
  line-height:52px;
  color: rgba(40, 52, 67, 1);
  z-index:100;
  font-size:16px;
}

.login-form .input-lg {
  font-size: 16px;
  height: 52px;
  padding: 10px 25px;
  border-radius: 0;
}

.login input[type="email"],
.login input[type="password"],
.login input:focus {
  background-color: rgba(40, 52, 67, 0.75);
  border: 0px solid #4a525f;
  color: #eee;
  border-left: 45px solid #93a5ab;
  border-radius:40px;
}

.login input:focus {
  border-left: 45px solid #eee;
}

input:-webkit-autofill,
textarea:-webkit-autofill,
select:-webkit-autofill {
  background-color: rgba(40, 52, 67, 0.75)!important;
  background-image: none;
  color: rgb(0, 0, 0);
  border-color: #FAFFBD;
}

.login .checkbox label,
.login .checkbox a {
  color: #ddd;
  vertical-align: top;
}
input[type="checkbox"]:checked + label::before,
.checkbox-success input[type="radio"]:checked + label::before {
    background-color: #25a08d !important;
}
.btn-success {
  background-color: #25a08d;
  background-image: none;
  padding: 8px 50px;
  margin-top:20px;
  border-radius: 40px;
  border: 1px solid #25a08d;
  -webkit-transition: all ease 0.8s;
  -moz-transition: all ease 0.8s;
  transition: all ease 0.8s;
}

.btn-success:focus,
.btn-success:hover,
.btn-success.active,
.btn-success.active:hover,
.btn-success:active:hover,
.btn-success:active:focus,
.btn-success:active {
  background-color: #25a08d;
  border-color: #25a08d;
  box-shadow: 0px 5px 35px -5px #25a08d;
  text-shadow:0 0 8px #fff;
  color: #FFF;
  outline:none;
}
$(document).ready(function(){
  
  $('ul.switcher li').click(function(){
    var tab_id = $(this).attr('data-tab');

    $('li').removeClass('active');
    $('div.tab-pane').removeClass('active');

    $(this).addClass('active');
    $("#"+tab_id).addClass('active');
  })

})

External CSS

  1. https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/css/bootstrap.min.css
  2. https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css
  3. https://cdnjs.cloudflare.com/ajax/libs/awesome-bootstrap-checkbox/0.3.7/awesome-bootstrap-checkbox.min.css

External JavaScript

  1. https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.0/jquery.min.js
  2. https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/js/bootstrap.min.js