tube/static/theme.css

:root {
    --main-title-color: #ae81ff;
    --link-hover-color: #ae81ff;
}

/* normalize */
* {
    font-weight: inherit;
    font-size: inherit;
    border: none;
    outline: none;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

a {
    color: inherit;
    text-decoration: none;
}

body {
    font-family: Arial, sans-serif;
    font-size: 16px;
    font-weight: 400;
    color: #c5c8c6;
    background: #1e1e1e;
    padding-bottom: 10px;
}

nav {
    z-index: 100;
    color: var(--main-title-color);
    text-shadow: -2px 2px 3px rgba(0, 0, 0, 0.7);
    font-weight: 700;
    font-size: 20px;
    text-indent: 20px;
    line-height: 50px;
    width: 100%;
    height: 50px;
    background: #171717;
    border-bottom: 1px solid #272727;
}

main {
    width: 1156px;
    margin:0 auto;
    margin-top: 15px;
    white-space: nowrap;
}

#player {
    width: 854px;
    display: inline-block;
    vertical-align: top;
}

/* 480p */
#video {
    width: 100%;
    height: 480px;
    background: #000;
    box-shadow: 0 3px 7px 0 rgba(0, 0, 0, 0.2);
}

#player > h1 {
    margin-top: 10px;
}

#player > h2 {
    margin-top: 5px;
    color: #676867;
    font-size: 90%;
}

#player > p {
    margin-top: 10px;
    font-size: 80%;
    width: 100%;
    white-space: normal;
}

#playlist {
    font-size: 13px;
    display: inline-block;
    margin-left: 10px;
    width: 290px;
    background: #282a2e;
    box-shadow: 0 3px 7px 0 rgba(0, 0, 0, 0.2);
}

#playlist > a {
    display: block;
    padding: 10px;
    position: relative;
    min-height: 54px;
}

#playlist > a:hover {
    color: var(--link-hover-color);
}

#playlist > a.playing {
    background: #383a3e;
}

#playlist > a + a {
    border-top: 1px solid #1e1e1e;
}

#playlist > a > img {
    width: 70px;
}

#playlist > a > div {
    position: absolute;
    top: 10px;
    right: 10px;
    bottom: 10px;
    left: 90px;
}

#playlist > a > div > h1 {
    white-space: normal;
}

#playlist > a > div > h2 {
    margin-top: 5px;
    color: #676867;
    font-size: 90%;
}

/* 360p */
@media only screen and (max-width: 1180px) {
    main {
        width: 940px;
    }
    #player {
        width: 640px;
    }
    #video {
        height: 360px;
    }
}

/* 240p */
@media only screen and (max-width: 965px) {
    main {
        width: 726px;
    }
    #player {
        width: 426px;
    }
    #video {
        height: 240px;
    }
}

/* 240p with shifted playlist */
@media only screen and (max-width: 750px) {
    main {
        width: 426px;
    }
    #player {
        width: 426px;
    }
    #video {
        height: 240px;
    }
    #playlist {
        width: 426px;
        margin-top: 10px;
        margin-left: 0;
        display: block;
    }
}

/* responsive width with shifted playlist */
@media only screen and (max-width: 440px) {
    main {
        width: 100%;
    }
    #player {
        width: 100%;
    }
    #video {
        height: auto;
    }
    #playlist {
        width: 100%;
        margin-top: 10px;
        margin-left: 0;
        display: block;
    }
}