html,body {
    margin: 0;
    padding: 0;
    background-color: whitesmoke;
    font-family: Lato;
}
.container {
    width: 100%;
    max-width: 900px;
    margin: auto;
}
#header {
    position: absolute;
    top: 0;
    left: 0;
    height: 44px;
    width: 100%;
    line-height: 44px;
    background-color: #fff;
    box-shadow: rgba(100, 100, 100, 0.247059) 0px 1px 3px 0px;
}
    #logo {
        background-image: url('logo.png');
        background-repeat: no-repeat;
        background-size: auto 38px;
        background-position: center;
        height: 44px;
        width: 112px;
        float: left;
        /* Hide the text. */
        text-indent: 100%;
        white-space: nowrap;
        overflow: hidden;
    }
    #dashboard-link {
        color: #555;
        float: right;
        text-decoration: none;
        padding: 0 12px;
    }
#body {
    position: absolute;
    top: 44px;
    left: 0;
    width: 100%;
    text-align: center;
    line-height: 160%;
    font-size: 18px;
}
    #body > .container {
        padding: 10px 20px;
        box-sizing: border-box;
        -webkit-box-sizing: border-box;
    }
        .explanation {
            position: relative;
        }
            .app-needs-install {
                display: none;
                margin: 0;
                width: 100%;
                position: absolute;
                top: 50%;
                transform: translateY(-50%);
                -webkit-transform: translateY(-50%);
            }
        .install-extension {
            background-color: #36AE4F;
            border-radius: 5px;
            border: 0;
            color: #fff;
            font-family: Lato;
            font-size: 28px;
            height: 60px;
            min-width: 255px;
            cursor: pointer;
        }
            .install-extension > .fa {
                margin-right: 5px;
            }
        .super-margins {
            margin: 64px 0;
        }
        .show-video, #docent-url {
            color: #3498DB;
        }
        .mobile {
            display: none;
        }
#body.mobile {
    display: block;
}
    .mobile .mobile {
        display: block;
    }
    .mobile .desktop {
        display: none;
    }
#modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    text-align: center;
    background-color: rgba(0, 0, 0, 0.4);
    display: none;
}
    #video-wrapper {
        position: relative;
        top: 40%;
        margin: 0 auto;
        transform: translateY(-40%);
        -webkit-transform: translateY(-40%);
        border-radius: 15px;
        padding: 15px;
        width: 520px;
        height: 353px;
        background-color: #f5f5f5;
    }
        .close {
            float: right;
            height: 30px;
            font-size: 16px;
            padding: 0;
            border: 0;
            background-color: whitesmoke;
            text-decoration: underline;
            font-family: Lato;
            color: #555;
            cursor: pointer;
        }
@media (max-width: 567px) {
    #video-wrapper {
        width: 285px;
        height: 225px;
    }
        #video {
            width: 285px;
            height: 200px;
        }
}