jellyfin-web/dashboard-ui/devices/windowsphone/wp.css

html, body, .ui-btn, .pageTitle {
    font-family: 'Segoe UI', Arial, sans-serif;
}

.viewMenuBar {
    background-color: #000;
}

.libraryViewNav, .libraryViewNav paper-tabs {
    background-color: #161616;
    box-shadow: none;
    text-transform: lowercase;
    font-size: 220%;
}

    .libraryViewNav a, paper-tab {
        font-weight: 400 !important;
    }

.background-theme-b, paper-dialog.background-theme-b {
    background: #161616;
}

.libraryViewNav #selectionBar {
    background-color: transparent !important;
}

.libraryViewNav .ui-btn-active, .libraryViewNav .iron-selected, .btnActiveCast {
    color: #52B54B !important;
}

.libraryViewNav .ui-btn-active {
    border-bottom-color: transparent;
}

.libraryPage:not(.noSecondaryNavPage) {
    padding-top: 105px !important;
}

.pageWithAbsoluteTabs:not(.noSecondaryNavPage) {
    padding-top: 108px !important;
}