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CSS

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JavaScript

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HTML 

              
                <form>  
  <input id="login" type="radio" name="tab"/>
  <label class="tab_label" for="login">log in</label>
  <input id="signup" type="radio" name="tab"/>
  <label class="tab_label" for="signup">sign up</label>  
  <figure class="reveal_login">
    <p>Please log in with your account.</p>
    <input type="text" placeholder="user"/>      
    <input type="password" placeholder="password"/> 
    <input id="logged_in" type="checkbox"/>
    <label class="content_label" for="logged_in">Keep me logged in</label>
    <input type="submit" value="Log in"/>
  </figure>  
  <figure class="reveal_signin">
    <p>You can register a new account.</p>
    <input type="text" placeholder="user"/>      
    <input type="password" placeholder="password"/> 
    <input type="submit" value="Sign up"/>
  </figure>
</form>
!

CSS 

              
                @import url(https://fonts.googleapis.com/css?family=Montserrat:400,700);
* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
  font-family: 'Montserrat';
}

*:after {
  content: '';
  clear: both;
  display: table;
}

body {
  background: #21242a;
  font-size: 14px;
}

form {
  position: relative;
  margin: auto;
  margin-top: 5em;
  width: 400px;
  background: #fff;
  border: 5px solid #ffa369;
  transition: all 300ms ease-in;
  box-shadow: 0px 50px 70px -40px rgba(0,0,0,.8);
  overflow: hidden;
}

form label.tab_label {
  float: left;
  color: #ffa369;
  font-size: 1.8em;
  text-transform: uppercase;
  text-align: center;
  line-height: 2.6em;
  width: 50%;
  transition: all 300ms ease-in;
  cursor: pointer;
}

form label.tab_label:hover,
form input[type="radio"]:checked + label.tab_label {
  background: #ffa369;
  color: #fff;
}

form input[id="login"]:checked ~ figure.reveal_login,
form input[id="signup"]:checked ~ figure.reveal_signin{
  background: #ffa369;
  height: initial;
  padding: 3em;
  z-index: 10000000;
}

form input[type="radio"] {
  display: none;
}

figure {
  float: left;
  width: 100%;
  height: 0px;
  transition: all 500ms cubic-bezier(0, 0, 0.4, 1.61);
}

figure p {
  color: #fff;
}

figure input {
  float: left;
  margin-top: 1em;
}

figure input:focus {
  outline: 0;
}

figure input::-webkit-input-placeholder {
  color: rgba(255,163,105,.7);
}

figure input[type="text"],
figure input[type="password"] {
  width: 100%;
  padding: .5em;
  border: 3px solid rgba(255,163,105,.7);
  color: #ffa369;
}

figure input[type="submit"] {
  float: right;
  background: #ffa369;
  border: 3px solid #fff;
  width: 50%;
  text-transform: uppercase;
  color: #fff;
  font-size: 1.2em;
  line-height: 1.6em;
  transition: all 300ms ease-in;
}

figure input[type="submit"]:hover {
  background: #fff;
  color: #ffa369;
}

figure input[type="checkbox"] {
  margin-top: 1.2em;
}

figure label.content_label {
  float: left;
  font-size: .7em;
  line-height: 2em;
  margin-top: 1.2em;
  margin-left: .4em;
  color: #fff;
}

.icon {
  position: absolute;
  left: 10px;
  top: 1.4em;
  color: rgba(255,163,105,.7);
}
!

JS
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