* {
    box-sizing: border-box;
    line-height: 1em;
    font-family: 'Open Sans';
    font-weight: 200;
}

img {
    max-width: 100%;
    height: auto;
}

html, body {
    width: 100%;
    height: 100%;
    min-height: 100%;
    padding: 0;
    margin: 0;
    color: #fff;
    background: #111213 url(/demo/bp/images/bg.jpg) center center no-repeat fixed;
    background-size: cover;
}

.container {
    max-width: 1600px;
    min-height: 100%;
    height: 100%;
    margin: 0 auto;
    overflow: hidden;
}

.logo {
    display: block;
    text-decoration: none;
    width: 146px;
    margin: 60px auto;
}

.logo > img {
    width: 100%;
    height: auto;
}

.guideline {
    text-align: center;
    max-width: 720px;
    margin: 0 auto -48px;
    color: rgba(255,255,255,.2);
    font-size: 14px;
}

.choices {
    position: relative;
    max-width: 720px;
    min-height: 100%;
    height: 100%;
    margin: 0 auto;
}

.choices > a {
    display: block;
    position: absolute;
    width: 50%;
    color: #fff;
    text-transform: uppercase;
    text-decoration: none;
    font-size: 23px;
}

.choice {
    transition: 0.4s margin; -o-transition: 0.4s margin; -moz-transition: 0.4s margin; -webkit-transition: 0.4s margin;
}

.choice:hover {
    margin-top: -7px;
}

.window {
    width: 100%;
    max-width: 720px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,.75);
}

.window .header {
    background-color: #e4e4e4;
    width: 100%;
    height: 40px;
    padding: 7px 14px;
    box-sizing: border-box;
}

.choice.white .window .header {
    border-radius: 0 12px 0 0;
}

.choice.dark .window .header {
    border-radius: 12px 0 0 0;
}

.window .header .circle {
    display: inline-block;
    background-color: #cacaca;
    width: 13px;
    height: 13px;
    border-radius: 50%;
}

.window > .content {
    width: 100%;
}

.choice.white {
    text-align: right;
    right: 0;
}

.choice.white img {
    float: right;
}

@media (max-width: 500px) {
    
    .choice.white,
    .choice.dark {
        text-align: center;
    }
    
    .choice .header {
        text-align: left;
    }
    
    .guideline {
        margin: 0;
    }
    
}