youtube static masthead

@namespace url(http://www.w3.org/1999/xhtml);
@-moz-document regexp("https?://www.youtube.com/.*") {
#masthead-positioner {
    top: 0 !important
    }
/* fixed masthead */
.ytcenter-site-watch #yt-masthead-container {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    margin: 0 auto;
    z-index: 999
    }
/* expanded masthead */
.ytcenter-site-watch #masthead-expanded {
    position: fixed !important;
    top: 42px !important;
    left: 0;
    right: 0;
    margin: 0 auto;
    z-index: 999
    }
    /* background */
    .ytcenter-site-watch #yt-masthead-container {
        background: transparent !important;
        border: 0 !important
        }
/* player margins */
html[data-player-size="small"] #player {
    margin-top: 114px !important
    }
html[data-player-size="large"] #player {
    margin-top: 0 !important
    }
.ytcenter-site-watch #yt-masthead  {
    opacity: .9
    }
/* logo width */
.ytcenter-site-watch #yt-masthead .yt-masthead-logo-container {
    width: auto !important;
    padding-right: 4px
    }
/* search */
#masthead-search {
    max-width: 100% !important;
    min-width: 100px !important
    }
/* masthead transition */
    /* in */
    html[data-player-size="large"] .ytcenter-site-watch #yt-masthead:hover {
        opacity: .9;
        transition: opacity .25s ease .2s
       }
    /* out */
    html[data-player-size="large"] .ytcenter-site-watch #yt-masthead:not(:hover) {
        opacity: 0;
        transition: opacity .25s ease 0s
        }
/* remove */
.ytcenter-site-watch #masthead-positioner-height-offset, #sb-button-notify, .branded-page-related-channels {
    display: none !important
    }
}