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HTML

              
                <br>
<br>
    <div class="cont">
        <div class="form sign-in">
            <h2>Welcome</h2>
            <label>
                <span>Email</span>
                <input type="email" />
            </label>
            <label>
                <span>Password</span>
                <input type="password" />
            </label>
            <p class="forgot-pass">Forgot password?</p>
            <button type="button" class="submit">Sign In</button>
         
        </div>
        <div class="sub-cont">
            <div class="img">
                <div class="img__text m--up">
                 
                    <h3>Don't have an account? Please Sign up!<h3>
                </div>
                <div class="img__text m--in">
                
                    <h3>If you already has an account, just sign in.<h3>
                </div>
                <div class="img__btn">
                    <span class="m--up">Sign Up</span>
                    <span class="m--in">Sign In</span>
                </div>
            </div>
            <div class="form sign-up">
                <h2>Create your Account</h2>
                <label>
                    <span>Name</span>
                    <input type="text" />
                </label>
                <label>
                    <span>Email</span>
                    <input type="email" />
                </label>
                <label>
                    <span>Password</span>
                    <input type="password" />
                </label>
                <button type="button" class="submit">Sign Up</button>
                
            </div>
        </div>
    </div>

    <script>
        document.querySelector('.img__btn').addEventListener('click', function() {
            document.querySelector('.cont').classList.toggle('s--signup');
        });
    </script>
              
            
!

CSS

              
                *,
*:before,
*:after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Open Sans', Helvetica, Arial, sans-serif;
    background: #ffffff;
}

input,
button {
    border: none;
    outline: none;
    background: none;
    font-family: 'Open Sans', Helvetica, Arial, sans-serif;
}

.tip {
    font-size: 20px;
    margin: 40px auto 50px;
    text-align: center;
}

.cont {
    border-radius: 20px;
    overflow: hidden;
    position: relative;
    width: 900px;
    height: 550px;
    margin: 0 auto 100px;
    background: #fff;
    box-shadow: -10px -10px 15px rgba(255, 255, 255, 0.3), 10px 10px 15px rgba(70, 70, 70, 0.15), inset -10px -10px 15px rgba(255, 255, 255, 0.3), inset 10px 10px 15px rgba(70, 70, 70, 0.15);
}

.form {
    position: relative;
    width: 640px;
    height: 100%;
    -webkit-transition: -webkit-transform 1.2s ease-in-out;
    transition: -webkit-transform 1.2s ease-in-out;
    transition: transform 1.2s ease-in-out;
    transition: transform 1.2s ease-in-out, -webkit-transform 1.2s ease-in-out;
    padding: 50px 30px 0;
}

.sub-cont {
    overflow: hidden;
    position: absolute;
    left: 640px;
    top: 0;
    width: 900px;
    height: 100%;
    padding-left: 260px;
    background: #fff;
    -webkit-transition: -webkit-transform 1.2s ease-in-out;
    transition: -webkit-transform 1.2s ease-in-out;
    transition: transform 1.2s ease-in-out;
    transition: transform 1.2s ease-in-out, -webkit-transform 1.2s ease-in-out;
}

.cont.s--signup .sub-cont {
    -webkit-transform: translate3d(-640px, 0, 0);
    transform: translate3d(-640px, 0, 0);
}

button {
    display: block;
    margin: 0 auto;
    width: 260px;
    height: 36px;
    border-radius: 30px;
    color: #fff;
    font-size: 15px;
    cursor: pointer;
}

.img {
    overflow: hidden;
    z-index: 2;
    position: absolute;
    left: 0;
    top: 0;
    width: 260px;
    height: 100%;
    padding-top: 360px;
}

.img:before {
    content: '';
    position: absolute;
    right: 0;
    top: 0;
    width: 900px;
    height: 100%;
    background-image: url("ext.jpg");
    opacity: .8;
    background-size: cover;
    -webkit-transition: -webkit-transform 1.2s ease-in-out;
    transition: transform 1.2s ease-in-out;
    transition: transform 1.2s ease-in-out, -webkit-transform 1.2s ease-in-out;
}

.img:after {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
}

.cont.s--signup .img:before {
    -webkit-transform: translate3d(640px, 0, 0);
    transform: translate3d(640px, 0, 0);
}

.img__text {
    z-index: 2;
    position: absolute;
    left: 0;
    top: 50px;
    width: 100%;
    padding: 0 20px;
    text-align: center;
    color: #fff;
    -webkit-transition: -webkit-transform 1.2s ease-in-out;
    transition: -webkit-transform 1.2s ease-in-out;
    transition: transform 1.2s ease-in-out;
    transition: transform 1.2s ease-in-out, -webkit-transform 1.2s ease-in-out;
}

.img__text h2 {
    margin-bottom: 10px;
    font-weight: normal;
}

.img__text p {
    font-size: 14px;
    line-height: 1.5;
}

.cont.s--signup .img__text.m--up {
    -webkit-transform: translateX(520px);
    transform: translateX(520px);
}

.img__text.m--in {
    -webkit-transform: translateX(-520px);
    transform: translateX(-520px);
}

.cont.s--signup .img__text.m--in {
    -webkit-transform: translateX(0);
    transform: translateX(0);
}

.img__btn {
    overflow: hidden;
    z-index: 2;
    position: relative;
    width: 100px;
    height: 36px;
    margin: 0 auto;
    background: transparent;
    color: #fff;
    text-transform: uppercase;
    font-size: 15px;
    cursor: pointer;
}

.img__btn:after {
    content: '';
    z-index: 2;
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    border: 2px solid #fff;
    border-radius: 30px;
}

.img__btn span {
    position: absolute;
    left: 0;
    top: 0;
    display: -webkit-box;
    display: flex;
    -webkit-box-pack: center;
    justify-content: center;
    -webkit-box-align: center;
    align-items: center;
    width: 100%;
    height: 100%;
    -webkit-transition: -webkit-transform 1.2s;
    transition: -webkit-transform 1.2s;
    transition: transform 1.2s;
    transition: transform 1.2s, -webkit-transform 1.2s;
}

.img__btn span.m--in {
    -webkit-transform: translateY(-72px);
    transform: translateY(-72px);
}

.cont.s--signup .img__btn span.m--in {
    -webkit-transform: translateY(0);
    transform: translateY(0);
}

.cont.s--signup .img__btn span.m--up {
    -webkit-transform: translateY(72px);
    transform: translateY(72px);
}

h2 {
    width: 100%;
    font-size: 26px;
    text-align: center;
}

label {
    display: block;
    width: 260px;
    margin: 25px auto 0;
    text-align: center;
}

label span {
    font-size: 12px;
    color: #cfcfcf;
    text-transform: uppercase;
}

input {
    display: block;
    width: 100%;
    margin-top: 5px;
    padding-bottom: 5px;
    font-size: 16px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.4);
    text-align: center;
}

.forgot-pass {
    margin-top: 15px;
    text-align: center;
    font-size: 12px;
    color: #cfcfcf;
}

.submit {
    margin-top: 40px;
    margin-bottom: 20px;
    background: #d4af7a;
    text-transform: uppercase;
}

.fb-btn {
    border: 2px solid #d3dae9;
    color: #8fa1c7;
}

.fb-btn span {
    font-weight: bold;
    color: #455a81;
}

.sign-in {
    -webkit-transition-timing-function: ease-out;
    transition-timing-function: ease-out;
}

.cont.s--signup .sign-in {
    -webkit-transition-timing-function: ease-in-out;
    transition-timing-function: ease-in-out;
    -webkit-transition-duration: 1.2s;
    transition-duration: 1.2s;
    -webkit-transform: translate3d(640px, 0, 0);
    transform: translate3d(640px, 0, 0);
}

.sign-up {
    -webkit-transform: translate3d(-900px, 0, 0);
    transform: translate3d(-900px, 0, 0);
}

.cont.s--signup .sign-up {
    -webkit-transform: translate3d(0, 0, 0);
    transform: translate3d(0, 0, 0);
}
              
            
!

JS

              
                
              
            
!
999px

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