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HTML

              
                <div id="app"></div>
              
            
!

CSS

              
                @import url('https://fonts.googleapis.com/css?family=Open+Sans:300,400,700');

$borderRadius: 1px;
$offset: 150%;
$inputHeight: 63px;
$transitionEasing: cubic-bezier(.36,1,.62,.98);

$background1: #433B7C;
$background2: #2C497F;

// $yellow: #FF6542;
$yellow: #ED6A5E;

@mixin box-shadow($props...) {
    -webkit-box-shadow: $props;
    -moz-box-shadow: $props;
    box-shadow: $props;
}

@mixin border-radius($radius) {
    -webkit-border-radius: $radius;
    -moz-border-radius: $radius;
    border-radius: $radius;
}

@mixin transition($transition...) {
    -moz-transition: $transition;
    -webkit-transition: $transition;
    transition: $transition;
}

html, body, .container, #app {
    width: 100%;
    height: 100%;
}

body {
    font-family: 'Open Sans', sans-serif;
    font-size: 16px;
    color: #fff;
    margin: 0 !important;
}

.app {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 100%;
    overflow-y: scroll;
    background-image: url('https://unsplash.it/1366/768?image=568');
    background-repeat: no-repeat;
    background-size: cover;
}

.form-block-wrapper {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 100%;
    @include transition(all .85s ease-in-out);
    &--is-login {
        opacity: .92;
        background-color: $background2;
    }
    &--is-signup {
        opacity: .94;
        background-color: $background1;
    }
}

.form-block {
    position: relative;
    margin: 100px auto 0;
    width: 285px;
    padding: 25px;
    background: rgba(255, 255, 255, .13);
    border-radius: 2 * $borderRadius;
    color: #fff;
    @include box-shadow(0px 0px 16px 9px rgba(0,0,0,0.07));
}

.form-block__header {
    margin-bottom: 20px;
    h1 {
        font-size: 30px;
        margin: 0 0 20px;
    }
}

.form-block__toggle-block {
    position: relative;
    span {
        font-size: 13px;
        font-weight: 300;
        color: rgba(255,255,255,.65);
    }
}

.form-block__input-wrapper {
    height: 2 * $inputHeight;
    position: relative;
    margin-bottom: 2px;
    @include transition(all .25s $transitionEasing .3s);
    .form-block--is-signup & {
        height: 4 * $inputHeight;
        @include transition(all .5s $transitionEasing .2s);
    }
}

.form-group {
    &--signup {
        position: absolute;
        top: 0;
        left: $offset;
        width: 100%;
    }
}

.form-group__input {
    display: block;
    font-size: 15px;
    color: #fff;
    width: 100%;
    box-sizing: border-box;
    font-size: 16px;
    padding: 14px 10px;
    margin-bottom: 15px;
    background: rgba(255,255,255,.25);
    border: 1px solid rgba(255,255,255,.1);
    border-radius: $borderRadius;
    &:focus {
        outline: none;
        border: 1px solid #fff;
        background: transparent;
    }
    .form-block--is-signup & {
        transform: translateX(-$offset);
    }
    .form-group--login & {
        opacity: 1;
        .form-block--is-signup & {
            opacity: 0;
        }
    }
    .form-group--signup & {
        opacity: 0;
        .form-block--is-signup & {
            opacity: 1;
        }
    }
}

@for $i from 1 through 4 {
    .form-group__input:nth-of-type(#{$i}) {
        @include transition(transform .35s $transitionEasing $i*.085s, opacity .3s ease-in-out .2s, background .15s ease-in-out, border .3s ease-in-out);
    }
}

.button {
    display: inline-block;
    padding: 15px 12px;
    margin-bottom: 0;
    font-size: 16px;
    font-weight: 400;
    text-transform: uppercase;
    text-align: center;
    white-space: nowrap;
    vertical-align: middle;
    cursor: pointer;
    background-image: none;
    border: none;
    border-radius: 2 * $borderRadius;
    @include transition(all .2s ease-in-out);
    @include box-shadow(0px 0px 13px 8px rgba(0,0,0,0.1));
    &--primary {
        background: $yellow;
        color: #fff;
    }
    &:hover {
        @include box-shadow(0px 0px 18px 15px rgba(0,0,0,0.15));
    }
}

.full-width {
    width: 100%;
}

input[type="checkbox"] {
    display: none;
    + label {
        &:before {
            content: '';
            display: block;
            position: absolute;
            top: 10px;
            right: 0;
            width: 43px;
            height: 8px;
            background: rgba(255, 255, 255, .4);
            cursor: pointer;
            @include border-radius(50px);
        }
        &:after {
            content: '';
            display: block;
            position: absolute;
            top: 1px;
            right: 18px;
            width: 25px;
            height: 25px;
            background: $yellow;
            cursor: pointer;
            @include border-radius(50%);
            @include box-shadow(1px 1px 0px 0px rgba(0,0,0,0.15));
            @include transition(all .3s ease-in-out);
        }
    }
    &:checked + label:after {
        right: 0;
    }
}

::-webkit-input-placeholder { /* Chrome/Opera/Safari */
    font-weight: 300;
    color: rgba(255, 2505, 255, .5);
}
::-moz-placeholder { /* Firefox 19+ */
    font-weight: 300;
    color: rgba(255, 255, 255, .5);
}
:-ms-input-placeholder { /* IE 10+ */
    font-weight: 300;
    color: rgba(255, 255, 255, .5);
}
:-moz-placeholder { /* Firefox 18- */
    font-weight: 300;
    color: rgba(255, 255, 255, .5);
}

.tooltip {
    padding: 7px;
    @include border-radius(1px);
    background: rgba(0,0,0,.5);
    color: #fff;
    font-size: 12px;
    position: absolute;
    top: -10px;
    right: 0
}

              
            
!

JS

              
                const mode = 'login';

class LoginComponent extends React.Component {
    constructor(props) {
        super(props);
        this.state = {
            mode: this.props.mode
        }
    }
    toggleMode() {
        var newMode = this.state.mode === 'login' ? 'signup' : 'login';
        this.setState({ mode: newMode});
    }
    render() {
        return (
            <div>
                <div className={`form-block-wrapper form-block-wrapper--is-${this.state.mode}`} ></div>
                <section className={`form-block form-block--is-${this.state.mode}`}>
                    <header className="form-block__header">
                        <h1>{this.state.mode === 'login' ? 'Welcome back!' : 'Sign up'}</h1>
                        <div className="form-block__toggle-block">
                            <span>{this.state.mode === 'login' ? 'Don\'t' : 'Already'} have an account? Click here &#8594;</span>
                            <input id="form-toggler" type="checkbox" onClick={this.toggleMode.bind(this)} />
                            <label htmlFor="form-toggler"></label>
                        </div>
                    </header>
                    <LoginForm mode={this.state.mode} onSubmit={this.props.onSubmit} />
                </section>
            </div>
        )
    }
}

class LoginForm extends React.Component {
    constructor(props) {
        super(props);
    }
    render() {
        return (
        <form onSubmit={this.props.onSubmit}>
            <div className="form-block__input-wrapper">
                <div className="form-group form-group--login">
                    <Input type="text" id="username" label="user name" disabled={this.props.mode === 'signup'}/>
                    <Input type="password" id="password" label="password" disabled={this.props.mode === 'signup'}/>
                </div>
                <div className="form-group form-group--signup">
                    <Input type="text" id="fullname" label="full name" disabled={this.props.mode === 'login'} />
                    <Input type="email" id="email" label="email" disabled={this.props.mode === 'login'} />
                    <Input type="password" id="createpassword" label="password" disabled={this.props.mode === 'login'} />
                    <Input type="password" id="repeatpassword" label="repeat password" disabled={this.props.mode === 'login'} />
                </div>
            </div>
            <button className="button button--primary full-width" type="submit">{this.props.mode === 'login' ? 'Log In' : 'Sign Up'}</button>
        </form>
        )
    }
}

const Input = ({ id, type, label, disabled }) => (
    <input className="form-group__input" type={type} id={id} placeholder={label} disabled={disabled}/>
);

const App = () => (
    <div className={`app app--is-${mode}`}>
        <LoginComponent
            mode={mode}
            onSubmit={
                function() {
                    console.log('submit');
                }
            }
        />
    </div>
);

ReactDOM.render( <App/>, document.getElementById("app"));


              
            
!
999px

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