body { padding: 0; margin: 0 }
#unity-container { position: fixed; width: 100%; height: 100%; }
#unity-canvas {
    width: 100%;
    height: 100%;
    background: white
}
#unity-loading-bar { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); display: none }
#unity-logo {
    width: 640px;
    height: 176px;
    background: url('unity-logo-dark.png') no-repeat center
}
#unity-progress-bar-empty { margin-left: auto; margin-right: auto; width: 141px; height: 18px; margin-top: 10px; background: url('progress-bar-empty-dark.png') no-repeat center }
#unity-progress-bar-full { width: 0%; height: 18px; margin-top: 10px; background: url('progress-bar-full-dark.png') no-repeat center }
#unity-warning { position: absolute; left: 50%; top: 5%; transform: translate(-50%); background: white; padding: 10px; display: none }
   .container {
       container-type: size;
       height: 100%;
       width: 100%;
       position: fixed;
   }

   .resize-at-will {
       display: flex;
       justify-content: center;
       align-items: center;
       background-color: white;
       height: 100%;
   }

   .maintain-aspect-ratio {
       display: flex;
       justify-content: center;
       align-items: center;
       aspect-ratio: 16 / 9;
       width: 100%;
   }

   @container (min-aspect-ratio: 16 / 9) {
       .maintain-aspect-ratio {
           width: auto;
           height: 100%;
       }
   }