<div class="container">
  <div class="formBox level-login">
    <div class="box boxShaddow"></div>
    <div class="box loginBox">
      <h2>LOGIN</h2>
      <form class="form">
        <div class="f_row">
          <label>Username</label>
          <input type="text" class="input-field" required>
          <u></u>
        </div>
        <div class="f_row last">
          <label>Password</label>
          <input type="password" class="input-field" required>
          <u></u>
        </div>
        <button class="btn"><span>GO</span><u></u>
          <svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" viewBox="0 0 415.582 415.582" xml:space="preserve">
                                <path d="M411.47,96.426l-46.319-46.32c-5.482-5.482-14.371-5.482-19.853,0L152.348,243.058l-82.066-82.064
                                      c-5.48-5.482-14.37-5.482-19.851,0l-46.319,46.32c-5.482,5.481-5.482,14.37,0,19.852l138.311,138.31
                                      c2.741,2.742,6.334,4.112,9.926,4.112c3.593,0,7.186-1.37,9.926-4.112L411.47,116.277c2.633-2.632,4.111-6.203,4.111-9.925
                                      C415.582,102.628,414.103,99.059,411.47,96.426z"/>
                                </svg>
        </button>
        <div class="f_link">
          <a href="" class="resetTag">Forgot your password?</a>
        </div>
      </form>
    </div>
    <div class="box forgetbox">
      <a href="#" class="back icon-back">
      <svg version="1.1" id="Capa_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" viewBox="0 0 199.404 199.404" style="enable-background:new 0 0 199.404 199.404;"
	 xml:space="preserve">
	<polygon points="199.404,81.529 74.742,81.529 127.987,28.285 99.701,0 0,99.702 99.701,199.404 127.987,171.119 74.742,117.876 
		199.404,117.876 "/>
</svg>
      </a>
      <h2>Reset Password</h2>
      <form class="form">
        <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, </p>
        <div class="f_row last">
          <label>Email Id</label>
          <input type="text" class="input-field" required>
          <u></u>
        </div>
        <button class="btn"><span>Reset</span><u></u>
          <svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" viewBox="0 0 415.582 415.582" xml:space="preserve">
                                <path d="M411.47,96.426l-46.319-46.32c-5.482-5.482-14.371-5.482-19.853,0L152.348,243.058l-82.066-82.064
                                      c-5.48-5.482-14.37-5.482-19.851,0l-46.319,46.32c-5.482,5.481-5.482,14.37,0,19.852l138.311,138.31
                                      c2.741,2.742,6.334,4.112,9.926,4.112c3.593,0,7.186-1.37,9.926-4.112L411.47,116.277c2.633-2.632,4.111-6.203,4.111-9.925
                                      C415.582,102.628,414.103,99.059,411.47,96.426z"/>
                                </svg>
        </button>
      </form>
    </div>
    <div class="box registerBox">
      <span class="reg_bg"></span>
      <h2>Register</h2>
      <form class="form">
        <div class="f_row">
          <label>Username</label>
          <input type="text" class="input-field" required>
          <u></u>
        </div>
        <div class="f_row">
          <label>Password</label>
          <input type="password" class="input-field" required>
          <u></u>
        </div>
        <div class="f_row last">
          <label>Repeat Password</label>
          <input type="password" class="input-field" required>
          <u></u>
        </div>
        <button class="btn-large">NEXT</button>
      </form>
    </div>
    <a href="#" class="regTag icon-add">
      <svg version="1.1" id="Capa_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" viewBox="0 0 357 357" style="enable-background:new 0 0 357 357;" xml:space="preserve">
<path d="M357,204H204v153h-51V204H0v-51h153V0h51v153h153V204z"/>
</svg>

    </a>
  </div>
</div>

* {
    margin: 0px;
    padding: 0px;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
}
html, body {
    background-color: #049081;
    font-family: sans-serif, Arial;
    height: 100%;
    width: 100%;
}
input, button {
    font-family: sans-serif, Arial;
    &:focus, &:active {
        outline: none;
    }
}
a {
    text-decoration: none;
    &:focus, &:active {
        outline: none;
    }
}
h1, h2, h3, h4, h5, h6 {
    font-weight: bold;
    letter-spacing: 1px;
}
.container {
    height: 100%;
    width: 100%;
    position: relative;
    text-align: center;
    &:before {
        content: '';
        height: 100%;
        width: 0px;
        display: inline-block;
        vertical-align: middle;
    }
}
.formBox {
    width: 460px;
    max-width: 100%;
    height: 552px;
    margin-left: -4px;
    margin-top: 50px;
    margin-bottom: 40px;
    position: relative;
    vertical-align: middle;
    display: inline-block;
    .box {
        text-align: left;
        background-color: #fff;
        border-radius: 8px; 
        padding: 60px 0px 40px 0;
        position: absolute;
        width: 100%;
        height: 100%;
        box-shadow: 0px 2px 11px -2px rgba(0, 0, 0, 0.5);
        transition: all 0.2s cubic-bezier(.35,.33,.75,.9);
    }
    h2 {
        border-left: 6px solid #ed2553; 
        color: #ed2553;
        padding: 0px 45px;
        font-size: 32px;
        line-height: 45px;
        height: 45px;
        text-transform: uppercase;
        margin-bottom: 50px;
        position: relative;
    }
    p {
        font-size: 18px;
        line-height: 27px;
        margin-bottom: 30px;
        color: #696969;
    }
    form {
        display: block;
        padding: 0px 50px;
        position: relative;
    }
    .f_row {
        position: relative;
        margin-bottom: 45px;
        height: 52px;
        &.shake {
            animation: shake 0.4s linear;
        }
        &.last {
            margin-bottom: 53px;
        }
        label {
            color: #3f3f3f;
            font-size: 25px;
            font-weight: normal;
            position: absolute;
            left: 0;
            top: 10px;
            opacity: 1;
            transition: all 0.3s cubic-bezier(1,-0.33,0,1.15);
            transform: translate(0px, 0px) scale(1);
            transform-origin: left top;
        }
        input {
            background-color: transparent;
            border: none;
            color: #3f3f3f;
            font-size: 25px;
            width: 100%;
            height: 100%;
            position: relative;
        }
        u {
            background-color: #e1e1e1;
            width: 100%;
            height: 2px;
            position: absolute;
            left: 0;
            bottom: 0;
            &:before {
                content: '';
                display: block;
                height: 100%;
                width: 0;
                background-color: #ed2553;
                transition: all 0.35s cubic-bezier(.35,.33,.84,.85);
            }
        }
        &.focus {
            label {
                opacity: 0.5;
                transform: translate(0px, -30px) scale(0.8);
            }
            u {
                &:before {
                    width: 100%;
                }
            }
        }
    }
    .reg_bg {
        border-radius: 50%;
        background-color: #ed2553;
        position: absolute;
        width: 900px;
        height: 900px;
        right: -115px;
        top: -190px;
        transform-origin: 100% 40%;
        transform: scale(0);
    }
    .regTag {
        line-height: 140px;
        box-shadow: 0px 2px 5px -1px rgba(0, 0, 0, 0.45);
        border-radius: 50%;
        background-color: #ed2553;
        color: #fff;
        font-size: 58px;
        text-align: center;
        width: 140px;
        height: 140px;
        position: absolute;
        right: -70px;
        top: 40px;
        z-index: 2;
        svg {
          fill: #fff;
          width: 38px;
          height: 38px;
        }
    }
    .registerBox {
        border-radius: 8px;
        background-color: #fff;
        right: 0;
        overflow: hidden;
        width: 100%;
        opacity: 0;
        visibility: hidden;
        backface-visibility: visible;
        z-index: 1;
        .f_row {
            label, input {
                color: #fff;
            }
            u {
                background-color: #f87c98;
                &:before {
                    background-color: #fff;
                }
            }
            &.last {
                margin-bottom: 40px;
            }
        }
        h2 {
            visibility: hidden;
            opacity: 0;
            transition: all 0.3s cubic-bezier(.48,.55,.69,.9);
            transform: translateX(-20px);
        }
        .form > div {
            visibility: hidden;
            opacity: 0;
            transition: all 0.3s cubic-bezier(.48,.55,.69,.9);
            transform: translateX(20px);
            &:nth-child(1) {
                transition-delay: 0.15s;
            }
            &:nth-child(2) {
                transition-delay: 0.2s;
            }
            &:nth-child(3) {
               transition-delay: 0.25s;
            }
        }
        .btn-large {
            opacity: 0;
            transition: all 0.3s cubic-bezier(.48,.55,.69,.9);
            transform: translateX(20px);
            transition-delay: 0.3s;
        }
    }
    .forgetbox {
        background-color: #56ADC7;
        overflow: hidden;
        opacity: 0;
        visibility: hidden;
        transform: translate(0px, 9px) scale(1.03);
        .back {
            position: absolute;
            top: 13px;
            left: 26px;
            color: #fff;
            font-size: 32px;
            font-weight: bold;
            animation: back 0.8s linear;
            animation-iteration-count: infinite;
            svg {
              fill: #fff;
              width: 20px;
              height: 20px;
            }
        }
        .f_row {
            label, input {
                color: #fff;
            }
            u {
                background-color: #7DC6DC;
                &:before {
                    background-color: #fff;
                }
            }
            &.last {
                margin-bottom: 40px;
            }
        }
        .btn {
            border-color: #7DC6DC;
            color: #7DC6DC;
            u {
                background-color: #7DC6DC;
            }
        }
        h2 {
            color: #fff;
            border-left-color: #fff;
            visibility: hidden;
            opacity: 0;
            transition: all 0.3s cubic-bezier(.48,.55,.69,.9);
            transform: translate(-20px, 0px);
        }
        .form > div {
            visibility: hidden;
            opacity: 0;
            transition: all 0.3s cubic-bezier(.48,.55,.69,.9);
            transform: translate(0px, 20px);
            transition-delay: 0.15s;
        }
        p {
            color: #fff;
            visibility: hidden;
            opacity: 0;
            transition: all 0.3s cubic-bezier(.48,.55,.69,.9);
            transform: translate(0px, 20px);
            transition-delay: 0.2s;
        }
        .btn {
            opacity: 0;
            transition: all 0.3s cubic-bezier(.48,.55,.69,.9);
            transform: translate(0px, 20px);
            transition-delay: 0.25s;
        }
    }
    &.level-login {
        .boxShaddow {
            opacity: 0.7;
            transform-origin: center top;
            transform: translate(0px, -9px) scale(0.97);
        }
    }
    &.level-reg {
        h2 {
            border-left-color: #fff;
            color: #fff;
        }
        .boxShaddow {
            opacity: 0.7;
            transform-origin: center top;
            transform: translate(0px, -18px) scale(0.94);
        }
        .loginBox {
            opacity: 0.7;
            transform-origin: center top;
            transform: translate(0px, -9px) scale(0.97);
        }
        .registerBox {
            opacity: 1;
            visibility: visible;
        }
        .regTag {
            animation: regTag 0.3s cubic-bezier(.48,.55,.73,.78), regTag2 0.3s cubic-bezier(.48,.55,.73,.78);
            animation-fill-mode: forwards; 
            //animation-direction: reverse;
        }
        .reg_bg {
            animation: regMask 0.3s cubic-bezier(.48,.55,.73,.78);
            animation-fill-mode: forwards; 
        }
        .form > div, .btn-large, h2 {
            visibility: visible;
            opacity: 1;
            transform: translateX(0px);
        }
    }
    &.level-reg-revers {
        .regTag {
            animation: regTagR 0.3s cubic-bezier(.48,.55,.73,.78), regTag2R 0.3s cubic-bezier(.48,.55,.73,.78);
            animation-fill-mode: forwards; 
        }
        .reg_bg {
            animation: regMaskR 0.3s cubic-bezier(.48,.55,.73,.78);
            animation-fill-mode: forwards; 
        }
    }
    &.level-forget {
        .boxShaddow {
            opacity: 0.7;
            transform-origin: center top;
            transform: translate(0px, -18px) scale(0.94);
        }
        .loginBox {
            opacity: 0.7;
            transform-origin: center top;
            transform: translate(0px, -9px) scale(0.97);
        }
        .forgetbox {
            transform: translate(0px, 0px) scale(1);
            opacity: 1;
            visibility: visible;
            p, form > div, .btn, h2 {
                visibility: visible;
                opacity: 1;
                transform: translate(0px, 0px);
            }
        }
    }
}
@keyframes back {
    0% { transform: translateX(0px); }
    70% { transform: translateX(-13px); }
    100% { transform: translateX(0px); }
}
@keyframes regMask {
    0% { transform: translate(0px, 0px) scale(0); }
    50% { transform: translate(100px, 100px) scale(0.5); }
    100% { transform: translate(0px, 0px) scale(1); }
}
@keyframes regMaskR {
    0% { transform: translate(0px, 0px) scale(1); }
    50% { transform: translate(150px, -150px) scale(0.5); }
    100% { transform: translate(0px, 0px) scale(0); }
}
@keyframes regTag {
    0% { transform: translate(0px, 0px) rotate(0deg); }
    25% { transform: translate(4px, 25px) rotate(11.25deg); }
    50% { transform: translate(-88px, 40px) rotate(22.5deg); }
    100% { transform: translate(-96px, 8px) rotate(45deg); }
}
@keyframes regTag2 {
    0% { width: 140px;height: 140px;line-height: 140px;box-shadow: 0px 2px 5px -1px rgba(0, 0, 0, 0.45); }
    100% { width: 70px;height: 70px;box-shadow: 0px 2px 5px -1px rgba(0, 0, 0, 0);line-height: 68px; }
}
@keyframes regTagR {
    0% { transform: translate(-96px, 8px) rotate(45deg); }
    25% { transform: translate(-88px, 40px) rotate(22.5deg); }
    50% { transform: translate(4px, 25px) rotate(11.25deg); }
    100% { transform: translate(0px, 0px) rotate(0deg); }
}
@keyframes regTag2R {
    0% { width: 70px;height: 70px;box-shadow: 0px 2px 5px -1px rgba(0, 0, 0, 0);line-height: 68px; }
    100% { width: 140px;height: 140px;line-height: 140px;box-shadow: 0px 2px 5px -1px rgba(0, 0, 0, 0.45); }
}
@keyframes shake {
  from, to {
    -webkit-transform: translate3d(0, 0, 0);
    transform: translate3d(0, 0, 0);
  }

  10%, 30%, 50%, 70%, 90% {
    -webkit-transform: translate3d(-10px, 0, 0);
    transform: translate3d(-10px, 0, 0);
  }

  20%, 40%, 60%, 80% {
    -webkit-transform: translate3d(10px, 0, 0);
    transform: translate3d(10px, 0, 0);
  }
}
.btn {
    transition: all 0.6s ease;
    background-color: #fff;
    border: 3px solid #dfdfdf;
    cursor: pointer;
    color: #dfdfdf;
    display: block;
    text-align: center;
    width: 243px;
    height: 73px;
    line-height: 73px;
    font-size: 23px;
    font-weight: bold;
    text-transform: uppercase;
    overflow: hidden;
    position: relative;
    margin-left: auto;
    margin-right: auto;
    span {
        position: absolute;
        left: 0;
        top: 0;
        width: 100%;
        height: 100%;
    }
    u {
        border-radius: 50%; 
        background-color: #ed2553;
        position: absolute;
        left: -23px;
        top: -103px;
        width: 280px;
        height: 280px;
        transition: all 0.25s cubic-bezier(.48,.55,.69,1.11);
        transform-origin: center center;
        transform: scale(0);
    }
    svg {
        fill: #fff;
        width: 35px;
        height: 35px;
        position: absolute;
        left: 50%;
        top: 50%;
        opacity: 0;
        transition: all 0.35s cubic-bezier(.48,.55,.69,1.11);
        transform: translate(-50%, -50%) rotate(-90deg) skew(18deg,12deg);
    }
    &.active, &:hover {
        border-color: #ed2553;
        color: #ed2553;
    }
    &.active {
        u {
            transform: scale(1);
        }
        svg {
            opacity: 1;
            transform: translate(-50%, -50%) rotate(0deg) skew(0deg, 0deg);
        }
    }
}
.btn-large {
    transition: all 0.6s ease;
    background-color: #fff;
    border: 3px solid #fff;
    cursor: pointer;
    color: #ed2553;
    display: block;
    text-align: center;
    width: 100%;
    height: 70px;
    line-height: 67px;
    font-size: 23px;
    font-weight: bold;
    text-transform: uppercase;
    position: relative;
    &.active, &:hover {
        background-color: #ed2553;
        border-color: #fff;
        color: #fff;
    }
}
.f_link {
    text-align: center;
    padding-top: 50px;
    a {
        color: #bdbdbd;
        font-size: 23px;
        transition: all 0.6s ease;
        &:hover {
            color: #56ADC7;
        }
    }
}
@media screen and (max-height: 650px) {
    .formBox {
        
    }
}
View Compiled
var inP     =   $('.input-field');

inP.on('blur', function () {
    if (!this.value) {
        $(this).parent('.f_row').removeClass('focus');
    } else {
        $(this).parent('.f_row').addClass('focus');
    }
}).on('focus', function () {
    $(this).parent('.f_row').addClass('focus');
    $('.btn').removeClass('active');
    $('.f_row').removeClass('shake');
});


$('.resetTag').click(function(e){
    e.preventDefault();
    $('.formBox').addClass('level-forget').removeClass('level-reg');
});

$('.back').click(function(e){
    e.preventDefault();
    $('.formBox').removeClass('level-forget').addClass('level-login');
});



$('.regTag').click(function(e){
    e.preventDefault();
    $('.formBox').removeClass('level-reg-revers');
    $('.formBox').toggleClass('level-login').toggleClass('level-reg');
    if(!$('.formBox').hasClass('level-reg')) {
        $('.formBox').addClass('level-reg-revers');
    }
});
$('.btn').each(function() {
     $(this).on('click', function(e){
        e.preventDefault();
        
        var finp =  $(this).parent('form').find('input');
       
       console.log(finp.html());
       
        if (!finp.val() == 0) {
            $(this).addClass('active');
        }
        
        setTimeout(function () {
            
            inP.val('');
            
            $('.f_row').removeClass('shake focus');
            $('.btn').removeClass('active');
            
        }, 2000);
         
        if(inP.val() == 0) {
            inP.parent('.f_row').addClass('shake');
        }
         
        //inP.val('');
        //$('.f_row').removeClass('focus');
        
    });
});

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

  1. https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js