html, body {
    background: none !important;
}

.content-wrap, .footer-wrap {
    background-color: hsl(200, 10%, 20%);
}

.header-wrap {
    background-image: url(/asset/image/os/bg.jpg);
    position: relative;
}

.header-bg {
    height: 100%;
    left: 0;
    object-fit: cover;
    opacity: 0;
    position: absolute;
    transition: opacity 0.2s cubic-bezier(0, 0, 0.2, 1);
    top: 0;
    width: 100%;
    z-index: -1;
}

.header-bg.show {
    opacity: 1;
}

.header-content-wrap {
    padding-top: 90px;
    padding-bottom: 90px;
}

#download-links {
    display: block;
    margin-bottom: -3px;
    text-align: center;
}

#download-links a {
    text-decoration: none;
}

#download-links img {
    height: 50px;
}

/*
.header-wrap {
    background: url(/image/bg_os2.jpg) top center;
    background-size: cover;
}
*/

@media only screen and (min-width: 800px) {
    #content-1 {
        padding-top: 15px;
    }
}

@media only screen and (max-width: 640px) {
    #content-1 {
        padding-left: 10px;
        padding-right: 10px;
    }

    #content-1 > div:first-child {
        margin-bottom: 13px;
    }

    #download-links img {
        height: 40px;
    }
}


#content-1 {
    margin: 0 auto;
    max-width: 900px;
}

#content-1 h1:first-of-type {
    margin-bottom: 10px;
}

#content-1 > .text {
    text-align: center;
}

#content-2 .image {
    background: url(/asset/image/os/visual.jpg) center;
    background-size: cover;
}

#content-3 .image {
    background: url(/asset/image/os/kingdom.jpg) center;
    background-size: cover;
}

#content-4 .image {
    background: url(/asset/image/os/battle.jpg) center;
    background-size: cover;
}

#content-5 .image {
    background: url(/asset/image/os/train.jpg) center;
    background-size: cover;
}

#content-6, #content-7 {
    padding: 0;
    padding-bottom: 20px;
    text-align: center;
}

#content-6 > .frame ,
#content-7 > .frame {
    background-color: black;
}

#content-6 .iframe-container-container,
#content-7 .iframe-container-container {
    margin-bottom: 10px;
    margin-left: auto;
    margin-right: auto;
    max-width: 920px;
}