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CSS

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HTML 

              
                <div class="flexin">

  <div class="tabs tabs-style-flip">
    <nav>
      <ul>
        <li><a href="#section-flip-1"><span><i class="fa fa-lock"></i> Login</span></a></li>
        <li><a href="#section-flip-2"><span><i class="fa fa-user-plus"></i> Sign Up</span></a></li>
      </ul>
    </nav>
    <div class="content-wrap">
      <section id="section-flip-1">

        <form class="ui large form">
          <div class="ui segment">
            <h2 class="ui header">Log-In to Your Account</h2>
            <div class="field">
              <div class="ui left icon input">
                <i class="user icon"></i>
                <input type="text" name="email" placeholder="E-mail address">
              </div>
            </div>
            <div class="field">
              <div class="ui left icon input">
                <i class="lock icon"></i>
                <input type="password" name="password" placeholder="Password">
              </div>
            </div>
            <div class="ui fluid large orange submit button">LOGIN</div>
          </div>
          <div class="ui error message"></div>
        </form>

        <div class="ui message">
          Don't have an account yet? <a href="#">SIGN UP</a>
        </div>
      </section>
      <section id="section-flip-2">

        <form class="ui large form">
          <div class="ui segment">
            <h2 class="ui header">Sign up for an Account</h2>
            <div class="field">
              <div class="ui left icon input">
                <i class="user icon"></i>
                <input type="text" name="email" placeholder="E-mail address">
              </div>
            </div>
            <div class="field">
              <div class="ui left icon input">
                <i class="lock icon"></i>
                <input type="password" name="password" placeholder="Choose a Password">
              </div>
            </div>
            
              <div class="field">
              <div class="ui left icon input">
                <i class="lock icon"></i>
                <input type="password" name="password" placeholder="Confirm Password">
              </div>
            </div>
            <div class="ui fluid large teal submit button">REGISTER</div>
          </div>
          <div class="ui error message"></div>
          <div class="g-recaptcha" style="width: 100%" data-sitekey="6Lcd4RcTAAAAAFdohXyb7LRFrEDkSua3VlVx8IBb"></div>
        </form>
        <div class="ui message">
          Already have an account? <a href="#">LOG IN</a>
        </div>
      </section>
    </div>
    <!-- /content -->
  </div>
  <!-- /tabs -->
</div>
!

CSS 

              
                /* Default tab style */

*,
html,
body {
  font-family: "Open Sans";
}

.flexin {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.flexin div.tabs-style-flip {
  max-width: 600px;
  box-shadow: 0px 50px 100px 0px rgba(30, 30, 30, .4);
  border-radius: 6px;
  height: auto;
  flex-grow: 2;
}

.tabs {
  position: relative;
  overflow: hidden;
  margin: 0 auto;
  width: 100%;
  font-weight: 400;
}


/* Nav */

.tabs nav {
  text-align: center;
}

.tabs nav ul {
  position: relative;
  display: -ms-flexbox;
  display: -webkit-flex;
  display: -moz-flex;
  display: -ms-flex;
  display: flex;
  margin: 0 auto;
  padding: 0;
  max-width: 1400px;
  list-style: none;
  -ms-box-orient: horizontal;
  -ms-box-pack: center;
  -webkit-flex-flow: row wrap;
  -moz-flex-flow: row wrap;
  -ms-flex-flow: row wrap;
  flex-flow: row wrap;
  -webkit-justify-content: center;
  -moz-justify-content: center;
  -ms-justify-content: center;
  justify-content: center;
}

.tabs nav ul li {
  position: relative;
  z-index: 1;
  display: block;
  margin: 0;
  text-align: center;
  -webkit-flex: 1;
  -moz-flex: 1;
  -ms-flex: 1;
  flex: 1;
}

.tabs nav a {
  position: relative;
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  line-height: 2.5;
  font-size: 1.5em;
}

.tabs nav a span {
  vertical-align: middle;
}

.tabs nav li.tab-current a {
  color: #303030;
}

.tabs nav a:focus {
  outline: none;
}


/* Icons */

.icon::before {
  z-index: 10;
  display: inline-block;
  margin: 0 0.4em 0 0;
  vertical-align: middle;
  text-transform: none;
  font-weight: normal;
  font-variant: normal;
  line-height: 1;
  speak: none;
  -webkit-backface-visibility: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}


/* Content */

.content-wrap {
  position: relative;
}

.content-wrap section {
  display: none;
  margin: 0 auto;
  padding: 1em;
  max-width: 1200px;
  text-align: center;
}

.content-wrap section.content-current {
  display: block;
}

.content-wrap section p {
  margin: 0;
  padding: 0.75em 0;
  color: rgba(40, 44, 42, 0.05);
  font-weight: 900;
  line-height: 1;
}


/* Fallback */

.no-js .content-wrap section {
  display: block;
  padding-bottom: 2em;
  border-bottom: 1px solid rgba(255, 255, 255, 0.6);
}

.no-flexbox nav ul {
  display: block;
}

.no-flexbox nav ul li {
  min-width: 15%;
  display: inline-block;
}

@media screen and (max-width: 58em) {
  .tabs nav a.icon span {
    display: none;
  }
  .tabs nav a:before {
    margin-right: 0;
  }
}


/*****************************/


/* Flip */


/*****************************/

.tabs-style-flip nav a {
  padding: 0.5em 0;
  color: rgba(30, 30, 30, .3);
  -webkit-transition: color 0.5s;
  transition: all 0.3s ease;
  top: 1px;
  z-index: 3;
  position: relative;
}

.tabs-style-flip nav a:first-child() {
  border-radius: 6px 0px 0px 0px;
}

.tabs-style-flip nav a:last-child() {
  border-radius: 0px 6px 0px 0px;
}

.tabs-style-flip nav a:hover,
.tabs-style-flip nav a:focus,
.tabs-style-flip nav li.tab-current a {
  color: rgba(30, 30, 30, .8);
}

.tabs-style-flip nav li.tab-current a {
  color: rgba(30, 30, 30, .8);
}

.tabs-style-flip nav a span {
  text-transform: uppercase;
  //letter-spacing: 1px;
  font-weight: 400;
}

.tabs-style-flip nav a::after {
  position: absolute;
  top: 0px;
  left: 0;
  z-index: -1;
  width: 100%;
  height: 100%;
  background-color: #eee;
  content: '';
  -webkit-transition: -webkit-transform 0.3s, background-color 0.3s;
  transition: transform 0.3s, background-color 0.3s;
  -webkit-transform: perspective(900px) rotate3d(1, 0, 0, 90deg);
  transform: perspective(900px) rotate3d(1, 0, 0, 90deg);
  -webkit-transform-origin: 50% 100%;
  transform-origin: 50% 100%;
  -webkit-perspective-origin: 50% 100%;
  perspective-origin: 50% 100%;
  transition: all 0.3s ease;
  border: 1px solid rgba(255, 255, 255, .8);
  border-bottom: none;
}

.tabs-style-flip nav li.tab-current a::after {
  background-color: #efefef;
  -webkit-transform: perspective(900px) rotate3d(1, 0, 0, 0deg);
  transform: perspective(900px) rotate3d(1, 0, 0, 0deg);
  box-shadow: inset 0px 0px 0px 0px rgba(30, 30, 30, .1);
}

.tabs-style-flip nav li.tab-current:nth-child(1) a::after {
  border-radius: 6px 0px 0px 0px;
  box-shadow: inset -10px 10px 10px 0px rgba(30, 30, 30, .1);
  transition: box-shadow 0.3s ease .05s;
}

.tabs-style-flip nav li.tab-current:nth-child(2) a::after {
  border-radius: 0px 6px 0px 0px;
  box-shadow: inset 10px 10px 10px 0px rgba(30, 30, 30, .1);
  transition: box-shadow 0.3s ease .05s;
}

.tabs-style-flip .content-wrap {
  background: #efefef;
  padding: 10px;
  border: 1px solid rgba(255, 255, 255, .8);
  border-radius: 0px 0px 6px 6px;
  z-index: 0;
}

.tabs-style-flip .content-wrap .header {
  font-weight: 400;
  text-transform: uppercase;
  border-bottom: 1px solid rgba(30, 30, 30, .2);
  padding-bottom: 10px;
  margin-bottom: 20px;
}

.content-wrap .segment {
  border: 1px solid rgba(30, 30, 30, .2);
  box-shadow: 0px 0px 0px 5px rgba(255, 255, 255, .3);
  border-radius: 6px;
  padding: 20px;
}
.content-wrap input {
  padding: 20px !important;
}
!

JS 

              
                /**
 * cbpFWTabs.js v1.0.0
 * http://www.codrops.com
 *
 * Licensed under the MIT license.
 * https://www.opensource.org/licenses/mit-license.php
 * 
 * Copyright 2014, Codrops
 * http://www.codrops.com
 */
;
(function(window) {

  'use strict';

  function extend(a, b) {
    for (var key in b) {
      if (b.hasOwnProperty(key)) {
        a[key] = b[key];
      }
    }
    return a;
  }

  function CBPFWTabs(el, options) {
    this.el = el;
    this.options = extend({}, this.options);
    extend(this.options, options);
    this._init();
  }

  CBPFWTabs.prototype.options = {
    start: 0
  };

  CBPFWTabs.prototype._init = function() {
    // tabs elems
    this.tabs = [].slice.call(this.el.querySelectorAll('nav > ul > li'));
    // content items
    this.items = [].slice.call(this.el.querySelectorAll('.content-wrap > section'));
    // current index
    this.current = -1;
    // show current content item
    this._show();
    // init events
    this._initEvents();
  };

  CBPFWTabs.prototype._initEvents = function() {
    var self = this;
    this.tabs.forEach(function(tab, idx) {
      tab.addEventListener('click', function(ev) {
        ev.preventDefault();
        self._show(idx);
      });
    });
  };

  CBPFWTabs.prototype._show = function(idx) {
    if (this.current >= 0) {
      this.tabs[this.current].className = this.items[this.current].className = '';
    }
    // change current
    this.current = idx != undefined ? idx : this.options.start >= 0 && this.options.start < this.items.length ? this.options.start : 0;
    this.tabs[this.current].className = 'tab-current';
    this.items[this.current].className = 'content-current';
  };

  // add to global namespace
  window.CBPFWTabs = CBPFWTabs;

})(window);





////////////////////////////
////////////////////////////
// CALL IT
////////////////////////////
////////////////////////////
(function() {

  [].slice.call(document.querySelectorAll('.tabs')).forEach(function(el) {
    new CBPFWTabs(el);
  });

})();
!
999px

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