fixed CSS for https://bugzilla.mozilla.org/show_bug.cgi?id=957527

login.css

body{
    position: relative;
}

.banner{
    position: relative;
    display: block;
    padding-top: 15.62%;
    -webkit-background-size: cover;
    background-size: cover;
    background-color: #d7d7d7;
    background-repeat: no-repeat;
    background-position: 0 0;
}

.dl-guide{
    text-align: center;
    position: absolute;
    top: 0;
    bottom: 0;
    width: 100%;
    background-color: #eee;
    z-index: 10;
}

.dl-guide header{
    height: 245px;
    background-color: #1f75cc;
    position: relative;
    background-image: url(img/welcome-cover.jpg?max_age=19830212&d=20140417134002),url(img/welcome-sticker.png?max_age=19830212&d=20140417134002);
    -webkit-background-size: 160px 138px,246px 103px;
    background-position: 50% 100%;
    background-repeat: no-repeat;
    color: #fff;
    background-size: 160px 138px,246px 103px;
}

.dl-guide header.wifi{
    background-image: url(img/welcome-cover.jpg?max_age=19830212&d=20140417134002),url(img/welcome-sticker.png?max_age=19830212&d=20140417134002),url(img/welcome-bg.jpg?max_age=19830212&d=20140417134002);
    -webkit-background-size: 160px 138px,246px 103px,cover;
    background-position: 50% 100%,50% 100%,50%;
    background-size: 160px 138px,246px 103px,cover;
}

.dl-guide h1{
    font-size: 20px;
    padding: 15px 0 13px;
}

.dl-guide h1:before{
    content: '';
    display: inline-block;
    width: 26px;
    height: 26px;
    background-image: url(sprite/login-chg140410172424.png?max_age=19830212&d=20140417134002);
    background-position: 0 0;
    margin-right: 5px;
    vertical-align: middle;
    margin-top: -4px;
}

.dl-guide .intro{
    line-height: 1.6;
}

.dl-guide .action{
    padding: 15px 0;
}

.dl-guide .item{
    display: block;
    margin: 0 auto;
    width: 240px;
    line-height: 38px;
    font-size: 16px;
    margin-top: 15px;
    background-color: #f8f8f8;
    border: 1px solid #b7b7b7;
    -webkit-border-radius: 1px;
    -moz-border-radius: 1px;
    border-radius: 1px;
}

.dl-guide .item.blue{
    background-color: #0264e9;
    border-color: #0264e9;
    color: #fff;
    margin-top: 0;
}

@media only screen and (-webkit-min-device-pixel-ratio:1.25),only screen and (min-resolution:120dpi),only screen and (min-resolution:1.25dppx){
    .dl-guide h1:before{
        background-image: url(sprite/login-chg140410172424@2x.png?max_age=19830212&d=20140417134002);
        background-size: 26px 26px;
        background-position: 0 0;
    }

}
#CssGaga{
    content: "140417134002,chg,324";
}