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HTML 

              
                <link href="https://fonts.googleapis.com/css?family=Open+Sans:400,700" rel="stylesheet" type="text/css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<div id="logmsk" style="display: block;">
    <div id='close'>X</div>
    <div id="userbox">
        <h1 id="signup" style="background-color: rgb(118, 171, 219); background-position: initial initial; background-repeat: initial initial;">Sign up</h1>
        <div id="sumsk" style="display: none;">Sending</div>
        <input id="name" placeholder="ID" style="opacity: 1; background-color: rgb(255, 255, 255); background-position: initial initial; background-repeat: initial initial;">
        <input id="pass" type="password" placeholder="Password" style="opacity: 1; background-color: rgb(255, 255, 255); background-position: initial initial; background-repeat: initial initial;">
        <p id="logint" style="opacity: 1;">Login as an existing user</p>
        <p id="nameal" style="display: none; opacity: 1;">ID:</p>
        <p id="passal" style="display: none; opacity: 1;">Password:</p>
        <button id="signupb" style="opacity: 0.2; cursor: default;">Sign up</button>
    </div>
</div>
!

CSS 

              
                /*!
 * Sign Up/Login Box v0.0.1 (https://codepen.io/koheishingai/FLvgs)
 * Copyright 2014 Kohei Shingai.
 * Licensed under MIT 
 */

#sumsk {
    position: absolute;
    width: 100%;
    height: 282px;
    z-index: 9999;
    display: none;
    color: rgba(0, 0, 0, 0.66);
    text-align: center;
    line-height: 279px;
    box-shadow: inset 0px 0px 50px rgba(0, 0, 0, 0.5);
    text-shadow: 0px 0px rgba(255, 255, 255, 0.57);
}

#nameal, #passal {
    margin: 0 37px;
    color: rgba(68, 68, 68, 0.78);
    display: none;
}

#nameal {
    margin-top: 13px;
    margin-bottom: 1px;
}

#signup,#name,#pass,#signupb {
    transition: all 0.3s ease 0s;
    -webkit-transition: all 0.3s ease 0s;
    -moz-transition: all 0.3s ease 0s;
    -o-transition: all 0.3s ease 0s;
}

#logint:hover {
    text-decoration: underline;
}

#logint {
    color: rgba(66, 134, 237, 0.78);
    cursor: pointer;
    text-decoration: none;
    width: 100%;
    margin: -4px 37px;
    font-size: 14px;
}

#name {
    -moz-appearance: none;
    -webkit-appearance: none;
    padding: 0 8px;
    margin: 44px auto;
    background: #fff;
    border: 1px solid #d9d9d9;
    border-top: 1px solid silver;
    -moz-border-radius: 1px;
    -webkit-border-radius: 1px;
    border-radius: 1px;
    color: #838383;
    width: 409px;
    display: block;
    margin-bottom: 10px;
    z-index: 1;
    position: relative;
    -moz-box-sizing: border-box;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
    direction: ltr;
    height: 44px;
    font-size: 16px;
    text-align: left;
}

#pass {
    -moz-appearance: none;
    -webkit-appearance: none;
    padding: 0 8px;
    margin: 16px auto;
    background: #fff;
    border: 1px solid #d9d9d9;
    border-top: 1px solid silver;
    -moz-border-radius: 1px;
    -webkit-border-radius: 1px;
    border-radius: 1px;
    color: #838383;
    width: 409px;
    display: block;
    margin-bottom: 10px;
    z-index: 1;
    position: relative;
    -moz-box-sizing: border-box;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
    direction: ltr;
    height: 44px;
    font-size: 16px;
    text-align: left;
}

#name:hover,#pass:hover {
    border: 1px solid #b9b9b9;
    border-top: 1px solid #a0a0a0;
    -moz-box-shadow: inset 0 1px 2px rgba(0,0,0,.1);
    -webkit-box-shadow: inset 0 1px 2px rgba(0,0,0,.1);
    box-shadow: inset 0 1px 2px rgba(0,0,0,.1);
}

#signup {
    margin: 0px;
    padding: 3px 0px 9px;
    color: rgb(255, 255, 255);
    font-size: 32px;
    width: 100%;
    text-align: center;
    font-weight: normal;
    background: #76ABDB;
    font-size: 22px;
}

#signupb {
    background: #f8f8f8;
    border: 1px solid #c6c6c6;
    display: inline-block;
    line-height: 23px;
    padding: 5px 18px;
    -webkit-border-radius: 2px;
    border-radius: 2px;
    background: #f37676;
    border-color: #E78282;
    font-weight: normal;
    margin: 10px 0 0 0;
    color: #fff;
    position: absolute;
    right: 9px;
    bottom: 9px;
    font-size: 17px;
    width: 103px;
    height: 35px;
    outline: none;
    cursor: pointer;
}

#userbox {
    position: absolute;
    width: 480px;
    height: 324px;
    background: white;
    top: 50%;
    margin-top: -174px;
    left: 50%;
    margin-left: -240px;
    box-shadow: 0px 1px 16px rgba(0, 0, 0, 0.45);
}

#close {
    position: absolute;
    right: 21px;
    top: -2px;
    color: white;
    font-weight: bold;
    font-size: 38px;
    -webkit-transition: all 0.2s ease 0s;
    cursor: pointer;
}

#close:hover {
    color: rgba(255, 255, 255, 0.85);
}

#logmsk {
    position: absolute;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.32);
    box-shadow: inset 0 0 376px rgba(0, 0, 0, 0.22);
    z-index: 9999;
    display: none;
}

body {
    width: 100%;
    height: 100%;
    min-width: 300px;
    min-height: 500px;
    overflow: hidden;
    margin: 0;
    padding: 0;
    position: absolute;
    background: #fff;
    color: #333;
}

#huser {
    line-height: 60px;
    position: absolute;
    right: 20px;
    margin-right: 42px;
    font-size: 14px;
    color: #AFAFAF;
    float: left;
    cursor: pointer;
}

body,input,select,td,textarea {
    font-family: "Open Sans",sans-serif;
}

#header {
    font: 13px/27px;
    position: relative;
    height: 60px;
    width: 100%;
    background: #f1f1f1;
    white-space: nowrap;
    display: -webkit-flex;
    display: flex;
    margin-left: 0!important;
    margin-right: 0!important;
}

#header::before {
    background: #e5e5e5;
    bottom: 0;
    content: '';
    display: block;
    height: 1px;
    left: 0;
    position: absolute;
    right: 0;
}

#logo {
    max-width: 202px;
    min-width: 202px;
    overflow: hidden;
    position: relative;
    z-index: 987;
    display: inline-block;
    -webkit-flex: 0 0 auto;
    flex: 0 0 auto;
    margin-left: 0!important;
    margin-right: 0!important;
    height: 60px;
    line-height: 58px;
    vertical-align: middle;
    text-indent: 10px;
    font-family: Fascinate,cursive;
    color: #868686;
    font-size: 21px;
    cursor: default;
}

#search {
    position: relative;
    width: 650px;
    z-index: 986;
    display: inline-block;
    margin-left: 0!important;
    margin-right: 0!important;
    min-width: 200px;
    -webkit-flex: 0 2 auto;
    flex: 0 2 auto;
    height: 60px;
    line-height: 58px;
    vertical-align: middle;
    padding: 0 30px;
}

#logoin {
    position: relative;
    padding: 0 30px;
    line-height: 60px;
    font-size: 20px;
    font-weight: 400;
    text-align: center;
    font-family: Fascinate,cursive;
    color: #757575;
    float: left;
}

#swrapi {
    padding-top: 14px;
}

#wraps1 {
    float: left;
    width: 560px;
    vertical-align: top;
    background: #fff;
    background-clip: padding-box;
    height: 30px;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
    border: 1px solid #b9b9b9;
    border-right-width: 0;
    -moz-box-shadow: none;
    -webkit-box-shadow: none;
    box-shadow: none;
    border-color: #a9a9a9;
    border-color: rgba(0,0,0,.3);
    position: relative;
}

#wraps2 {
    width: 100%;
    height: 28px;
}

.footer.content.clearfix {
    padding: 7px 16px 0;
    zoom: 1;
    font-size: .85em;
    white-space: nowrap;
    line-height: 0;
}

#footer-list {
    float: left;
    max-width: 80%;
    padding: 0;
}

#footer-list li {
    color: #777;
    display: inline;
    padding: 0 1.5em 0 0;
    cursor: pointer;
}

#footer-list li:hover {
    color: #aaa;
    display: inline;
    padding: 0 1.5em 0 0;
}

#footer-list a {
    color: #777;
    cursor: pointer;
    text-decoration: none;
}

#footer-list a:hover {
    color: #aaa;
    cursor: pointer;
    text-decoration: none;
}

.footer-bar {
    position: absolute;
    bottom: 0;
    height: 35px;
    width: 100%;
    border-top-width: 1px;
    border-top-style: solid;
    border-top-color: #e5e5e5;
    overflow: hidden;
    color: #777;
    font-family: Arial,sans-serif;
    font-size: 13px;
    background-color: #f2f2f2;
}

.js-selected-navigation-item.selected {
    color: #696969;
    text-decoration: none;
    display: inline-block;
    padding: 0 0 8px;
    margin: 0 10px;
    border-bottom-width: 3px;
    border-bottom-style: solid;
    border-bottom-color: #f37676;
    font-size: 14px;
    font-weight: 700;
}

.js-selected-navigation-item {
    color: #666;
    text-decoration: none;
    display: inline-block;
    padding: 0 0 8px;
    margin: 0 10px;
    border-bottom-width: 3px;
    border-bottom-style: solid;
    border-bottom-color: transparent;
    font-size: 14px;
}

.pagehead.explore-head {
    position: relative;
    margin-bottom: 0;
    padding-top: 10px;
    padding-bottom: 10px;
    padding-left: 10px;
    padding-right: 10px;
    border-bottom-width: 1px;
    border-bottom-style: solid;
    border-bottom-color: #f1f1f1;
}

.container4 {
    width: 100%;
    margin-left: auto;
    margin-right: auto;
    position: relative;
}

.marketing-nav {
    position: absolute;
    bottom: -11px;
    right: 0;
}

.marketing-nav ul {
    padding: 0;
    margin-top: 0;
    margin-bottom: 0;
}

.marketing-nav li {
    display: inline-block;
}

.container4 h1 {
    font-family: 'Open Sans' sans-serif;
    font-size: 17px!important;
    color: #FFA622;
    cursor: default;
    float: left;
    position: absolute;
}

#sidem {
    height: 100%;
    top: 0;
    bottom: 0;
    left: 0;
    width: 270px;
    background: #fff;
    border-right: 1px solid #f1f1f1;
    float: left;
}

#tbar {
    -webkit-backface-visibility: hidden;
    height: 40px;
    z-index: 100;
    position: relative;
    font-family: Fascinate,cursive;
    text-align: center;
    line-height: 40px;
    background: #FFF;
    border-bottom: 1px solid #f1f1f1;
    font-size: 16px;
    color: #76ABDB;
    cursor: default;
}

.upload {
    position: relative;
    display: inline-block;
    -webkit-border-radius: 2px;
    border-radius: 2px;
    font-size: 11px;
    text-align: center;
    white-space: nowrap;
    margin-right: 16px;
    height: 27px;
    line-height: 27px;
    min-width: 54px;
    outline: 0;
    padding: 0 8px;
    -webkit-box-shadow: none;
    box-shadow: none;
    border: 1px solid #dcdcdc;
    border: 1px solid rgba(0,0,0,.1);
    border: 1px solid rgba(0,0,0,.1);
    color: #797979;
    background-color: transparent;
    background-image: linear-gradient(top,#f5f5f5,#f1f1f1);
    background-image: -webkit-gradient(linear,left top,left bottom,from(#f5f5f5),to(#f1f1f1));
    background-image: -webkit-linear-gradient(top,#f5f5f5,#f1f1f1);
    font-weight: 700;
    font-family: 'Open Sans' sans-serif;
    cursor: pointer;
    margin-left: 260px;
    float: left;
}

.reload {
    position: relative;
    display: inline-block;
    -webkit-border-radius: 2px;
    border-radius: 2px;
    font-size: 11px;
    text-align: center;
    white-space: nowrap;
    margin-right: 16px;
    height: 27px;
    line-height: 27px;
    min-width: 54px;
    outline: 0;
    padding: 0 8px;
    -webkit-box-shadow: none;
    box-shadow: none;
    border: 1px solid #dcdcdc;
    border: 1px solid rgba(0,0,0,.1);
    border: 1px solid rgba(0,0,0,.1);
    color: #797979;
    background-color: transparent;
    background-image: linear-gradient(top,#f5f5f5,#f1f1f1);
    background-image: -webkit-gradient(linear,left top,left bottom,from(#f5f5f5),to(#f1f1f1));
    background-image: -webkit-linear-gradient(top,#f5f5f5,#f1f1f1);
    font-weight: 700;
    font-family: 'Open Sans' sans-serif;
    cursor: pointer;
    margin-left: -5px;
}

#drop {
    margin-left: 270px;
    display: none;
}

#dropa {
    margin: 18px auto;
    width: 100%;
    height: 100%;
    outline: 5px dashed #D5D5D5;
    text-align: center;
    color: #D5D5D5;
    font-weight: 700;
    font-family: 'Open Sans',sans-serif;
}

#login {
    color: #fff;
    margin-top: 9px;
    display: block;
    height: 40px;
    width: 40px;
    -webkit-border-radius: 40px;
    -moz-border-radius: 40px;
    -ms-border-radius: 40px;
    -o-border-radius: 40px;
    border-radius: 40px;
    -webkit-transition: all .05s;
    -moz-transition: all .05s;
    -o-transition: all .05s;
    transition: all .05s;
    background-color: #FFF;
    position: absolute;
    right: 12px;
    cursor: pointer;
}

#login:hover {
    background: 0 0;
}

#login span {
    display: block;
    text-indent: -999em;
    position: relative;
    margin: 0 auto;
    text-align: center;
    top: 14px;
    height: 12px;
    width: 12px;
    background-image: url(http://cdn.siteinspire.com/assets/sprites-sad27f83155-0c3629f75b3614325eb402249f5afdca.png);
    background-position: 0 -273px;
    background-repeat: no-repeat;
}

#dialog {
    display: none;
}

.overlay {
    position: fixed;
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
    background-color: rgba(0,0,0,.5);
    z-index: 10;
}

.modal {
    width: 300px;
    height: 200px;
    line-height: 200px;
    position: fixed;
    top: 50%;
    left: 50%;
    margin-top: -100px;
    margin-left: -150px;
    background-color: #f1c40f;
    border-radius: 5px;
    text-align: center;
    z-index: 11;
}

.js-selected-navigation-item:hover {
    color: silver;
}

.js-selected-navigation-item.selected:hover {
    color: #696969!important;
    cursor: default!important;
}

.reload:hover,.upload:hover {
    -webkit-box-shadow: 0 1px 1px rgba(0,0,0,.1);
    box-shadow: 0 1px 1px rgba(0,0,0,.1);
    border: 1px solid rgba(119,119,119,.3);
    color: #5F5F5F;
}

.reload:active,.upload:active {
    border: 1px solid rgba(138,138,138,.3);
    color: #696969;
    box-shadow: inset 0 0 12px rgba(213,213,213,.07);
}

@media (max-width:580px) {
    #sidem,.pagehead.explore-head {
        display: none;
    }

    #drop,#ifr {
        display: none!important;
    }
}

#close {
    display: none;
}
!

JS 

              
                /*!
 * Sign Up/Login Box v0.0.1 (https://codepen.io/koheishingai/FLvgs)
 * Copyright 2014 Kohei Shingai.
 * Licensed under MIT 
 */

$(function () {
    var user = {},
        flg = {};
    init();
    $('.upload').click(function () {
        if (flg.upd == 0) {
            upd('upload');
            flg.upd = 1
        } else {
            upd('');
            flg.upd = 0
        }
    });
    $('#login').click(function () {
        initub();
        $('#logmsk').fadeIn();
        ub(0)
    });
    $('#logint').click(function () {
        initub();
        if (flg.logt == 0) {
            ub(1);
            flg.logt = 1
        } else {
            ub(0);
            flg.logt = 0
        }
    });
    $("#name").keyup(function () {
        var len = $('#name').val().length;
        if (len > 13 || len == 0) {
            $('#name').css('background', 'rgb(255, 214, 190)');
            blsp();
            if (len != 0) {
                $('#nameal').css('color', 'rgb(255, 57, 19)').text('ID: Too long').fadeIn()
            } else {
                $('#nameal').css('color', 'rgb(255, 57, 19)').text('ID: Null').fadeIn()
            }
            flg.name = 1
        } else {
            $('#name').css('background', 'rgb(255, 255, 255)');
            $('#nameal').css('color', 'rgb(17, 170, 42)').text('ID: Ok').fadeIn();
            flg.name = 0;
            tcheck()
        }
    });
    $("#pass").keyup(function () {
        var len = $('#pass').val().length;
        if (len > 10 || len == 0) {
            $('#pass').css('background', 'rgb(255, 214, 190)');
            blsp();
            if (len != 0) {
                $('#passal').css('color', 'rgb(255, 57, 19)').text('Password: Too long').fadeIn()
            } else {
                $('#passal').css('color', 'rgb(255, 57, 19)').text('Password: Null').fadeIn()
            }
            flg.pass = 1
        } else {
            $('#pass').css('background', 'rgb(255, 255, 255)');
            $('#passal').css('color', 'rgb(17, 170, 42)').text('Password: Ok').fadeIn();
            flg.pass = 0;
            tcheck()
        }
    });

    function tcheck() {
        if (flg.name == 0 && flg.pass == 0) {
            $('#signupb').css('opacity', '1').css('cursor', 'pointer')
        } else {
            blsp()
        }
    }
    $('#signupb').click(function () {
        if (flg.name == 0 && flg.pass == 0) {
            $('#sumsk').fadeIn();
            $('#name, #pass, #logint, #nameal, #passal, #signupb').css('opacity', '0.2');
            $('#close').fadeIn()
        }
    });
    $('#close').click(function () {
        init();
        initub();
        $('#close').hide()
    });

    function init() {
        flg.logt = 0
    }

    function initub() {
        flg.name = -1;
        flg.pass = -1;
        $('#sumsk').hide();
        $('#nameal').hide();
        $('#passal').hide();
        $('#name, #pass, #logint, #nameal, #passal, #signupb').css('opacity', '1');
        $('#name').css('background', 'rgb(255, 255, 255)');
        $('#pass').css('background', 'rgb(255, 255, 255)');
        $('#signupb').css('opacity', '0.2').css('cursor', 'default');
        $('#name, #pass').val('')
    }

    function upd(button) {
        location.hash = button;
        if (flg.upd == 0) {
            $('#drop').fadeIn()
        } else {
            $('#drop').fadeOut()
        }
    }

    function ub(flg) {
        if (flg == 0) {
            $('#signup').text('Sign up').css('background', '#76ABDB');
            $('#signupb').text('Sign up');
            $('#logint').text('Login as an existing user')
        } else {
            $('#signup').text('Login').css('background', '#FFA622');
            $('#signupb').text('Login');
            $('#logint').text('Sign up as a new user')
        }
    }

    function blsp() {
        $('#signupb').css('opacity', '0.2').css('cursor', 'default')
    }
});
!
999px

Console