jellyfin_seymour/transparent_header.css

/* Top menu transparency https://jellyfin.org/docs/general/clients/css-customization.html#transparent-top-menu */
.skinHeader.focuscontainer-x.skinHeader-withBackground.skinHeader-blurred {
    background: none !important; 
    background-color: rgba(0, 0, 0, 0) !important;
}
.skinHeader.focuscontainer-x.skinHeader-withBackground.skinHeader-blurred.noHomeButtonHeader {
    background: none !important; 
    background-color: rgba(0, 0, 0, 0) !important;
}
.emby-tab-button.show-focus:focus,
.emby-tab-button:hover {
    color: ###accent### !important;
}
.skinHeader.focuscontainer-x.skinHeader-withBackground.skinHeader-blurred .paper-icon-button-light:hover:not(:disabled) {
    color: ###accent### !important;
    background-color: rgba(###accent_rgb###, .2) !important;
}