#sky {
    overflow: hidden;
    z-index: -1;
    position: fixed;
    left: 0px;
    bottom: 0vh;
    width: 100%;
    height: calc(100vh - 46vw);
    /*background: linear-gradient(0deg, #5278b7 0%, #5278b7 5%, rgba(0, 0, 0, 1) 100%);*/
    /*background: linear-gradient(0deg, #5278b7 0%, #5278b7 10%, #142c54 80%, rgba(0, 0, 0, 1) 100%);*/
    background: #819eca;
}

#iss {
    /* AR 57.6 */
    overflow: hidden;
    z-index: -120;
    position: fixed;
    width: 70vw;
    height: calc(0.7 * 57.6vw);
    left: 15vw;
}

#iss2 {
    /* AR 46.9*/
    overflow: hidden;
    z-index: -10;
    position: fixed;
    bottom: 0px;
    /*width: 100%;*/
    max-width: 100%;
    max-height: 100%;
    margin: auto;
}

#ground {
    /* AR 46.9*/
    overflow: hidden;
    z-index: -1;
    position: fixed;
    left: calc(50% - 106vh);
    bottom: 0px;
    width: 213vh;
    height: 100vh;
}

#moon {
    /* AR 47.6 */
    position: relative;
    left: 0px;
    bottom: 0px;
    width: 213vh;
    height: 100vh;
    margin-top: -100vh;
    z-index: -1;
}

#earth {
    position: fixed;
    width: 800vw;
    height: 250vh;
    background-image: radial-gradient(#9c97ec 12.5%, #382fc0 25%, #00000000 50%);
    left: -350vw;
    z-index: -2;
}

#video {
    position: fixed;
    right: 0;
    bottom: 0;
    min-width: 100%;
    min-height: 100%;
    z-index: -15;
}