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HTML

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CSS

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                #loginBox
    .firstName
        h4 First Name
        .firstNameIcon.icon
            i.fa.fa-user.fa-2x(aria-hidden='true')
        input(name="firstName" type="text")
    .lastName
        h4 Last Name
        .lastNameIcon.icon
            i.fa.fa-user.fa-2x(aria-hidden='true')
        input(name="lastName" type="text") 
    .language
        h4 Language
        .languageIcon.icon
             i.fa.fa-language.fa-2x(aria-hidden='true')
        .styleSelect
            select#lang
                option(value="en") English
                option(value="zh") 中文
    button.button →
#login
    .close 
        span.closeButton x
    p.msg
    span.blink
!

CSS 

              
                $iconBox: 40px
$loginBoxWidth: 380px
$colorPurple: #B993D6
$colorBlue: #8CA6DB
$colorRed: rgb(186, 49, 80)
*
    // border: 1px solid

body, html
    margin: 0
    box-sizing: border-box
    padding: 15px
    background: linear-gradient(to left, $colorPurple , $colorBlue)
    width: 100%
    height: 100%
    display: flex
h4
    margin: 0
    padding: 30px 40px 0px 50px
    opacity: 0.5
#loginBox
    width: $loginBoxWidth
    margin: auto
    position: relative
    z-index: 1
    padding-bottom: 40px
    border-radius: 8px
    background-color: #EEE
    padding: 20px 20px 60px
    box-shadow: 0 0 10px #777
    transition: 0.5s
    &:hover
        background-color: #FFF
    
.icon
    width: $iconBox
    height: $iconBox
    text-align: center
.icon, input, .styleSelect
    display: inline-block
    vertical-align: bottom
input
    margin-bottom: 5px
    margin-left: 10px
    width: calc(90% - #{$iconBox})
    height: 27px
    border: 0px solid 
    border-bottom: 2px solid rgba($colorPurple, 0.3)
    outline: none
    transition: 0.3s
    font-size: 20px
    background-color: transparent
    &:focus
        border-color: $colorPurple
    &.warn
        border-bottom-color: $colorRed
.styleSelect
    margin-top: 15px
    margin-left: 5px
    margin-bottom: 5px
    background: url(http://i62.tinypic.com/15xvbd5.png) no-repeat 96% 0
    height: 32px
    overflow: hidden
    width: calc(95% - #{$iconBox})
    border: 1px solid $colorPurple
    #lang
        background: transparent
        border: none
        font-size: 14px
        height: 32px
        padding: 5px
        width: 150%
.button
    border-radius: 50%
    background-color: $colorRed
    color: white
    position: absolute
    width: 50px
    height: 50px
    right: 20px
    font-size: 22px
    bottom: -18px
    border: none
    cursor: pointer
    box-shadow: 0 0 10px #777
    
#login
    position: absolute
    width: 50%
    height: auto
    left: 50%
    top: 50%
    transform: translate(-50%, -50%)
    z-index: 3
    background-color: #EFEFEF
    padding: 20px 20px 60px
    box-shadow: 0 0 10px #777
    transition: 0.5s
    border-radius: 10px
    display: none
    .close
        text-align: right
        box-sizing: border-box
        margin-bottom: 10px
        .closeButton
            font-size: 40px
            display: inline-block
            cursor: pointer
            width: 40px
            height: 40px
            line-height: 30px
            text-align: center
    p
        width: 100%
        margin: 0 auto
        font-size: 20px
        padding-right: 0.1em
        height: 100%
        display: inline
    .active
        border-right: 2px solid #333
!

JS 

              
                // Constructor
let greetr = function(firstName, lastName, language) {
    this.firstName = firstName;
    this.lastName = lastName;
    this.language = language;
}
greetr.prototype = {
    greeting: function() {
        if (this.language === "en") {
            return "Hello, " + this.firstName + ' ' + this.lastName;
        } else {
            return "你好, " + this.firstName + ' ' + this.lastName;
        }
    }
}

//  Add TypeWritter Effect
let count = 0;
let blink = function() {
    if (count == 0) {
        $('.blink').addClass('active');
        count = 1;
    } else {
        $('.blink').removeClass('active');
        count = 0;
    }
}
let end = 0;
let typeWriter = function(msg) {
    blink();
    end++;
    $('.msg').html(msg.substr(0, end));
    if (end == msg.length + 1) clearInterval(clock);
    blink();
}

//  Check InputValue
let checkInputVal = function(el) {
    $(el).focus().addClass('warn');
    $(el).blur(function() {
        if ($(this).val()) {
            $(this).removeClass('warn');
        };
    })
}

let guest, clock, blinkr, firstName, lastName, language, msg;
$("#loginBox").on('click', ".button", function() {
    firstName = $('input[name=firstName]').val();
    lastName = $('input[name=lastName]').val();
    language = $("#lang").val();

    if (firstName && lastName) {
        guest = new greetr(firstName, lastName, language);
        msg = guest.greeting();
        $("#loginBox").hide();
        $("#login").show();
        clock = setInterval(typeWriter, 100, msg);
        blinkr = setInterval(blink, 500);
    } else {
        if (!firstName) {
            checkInputVal('input[name="firstName"]');
        } else if (!lastName) {
            checkInputVal('input[name="lastName"]');
        };

    }
})

$('.closeButton').on('click', function() {
    $("#loginBox").show();
    $("#login").hide();
    $('.msg').html('');
    clearInterval(blinkr);
    clearInterval(clock);
    end = 0;
})

//  for debug

// $("#loginBox").hide();
// $("#login").show();
// let msg = "Lorem Ipsum is simply dummy text of the printing ";
// let clock = setInterval(typeWriter, 50, msg);
// let blinkr = setInterval(blink, 500);
!
999px

Console