libreflix-desktop/assets/css/base.css

 
body {
    height: 100%;
    display: flex;
    justify-content: space-around;
    align-items: center;
    background: #000000;
}
#webview {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: inline-flex !important;
}