html, body {
  height: 100%;
  margin: 0;
}
#unity-container {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: url("WebGLLoadingScreenBG.jpg") center / cover no-repeat #000;
}
#unity-container.unity-desktop { left: 50%; top: 50%; transform: translate(-50%, -50%) }
#unity-container.unity-mobile { position: fixed; width: 100%; height: 100% }
#canvas-wrap {
  position: relative;             /* якорь для corner-ui */
  display: inline-block;          /* габарит = размеру канваса */
  line-height: 0;                 /* чтобы не было лишних отступов */
}
#unity-canvas {
  display: block;
}
#corner-ui {
  position: absolute;
  right: 8px; bottom: 8px;        /* всегда у нижнего правого края канваса */
  display: flex; gap: 8px; align-items: center;
}
#diagnostics-icon { width: 32px; height: 32px; cursor: pointer; }
.unity-mobile #unity-canvas { width: 100%; height: 100% }
#unity-loading-bar { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); display: none }
#unity-logo { width: 154px; height: 130px; background: url('unity-logo-dark.png') no-repeat center }
#unity-progress-bar-empty { width: 141px; height: 18px; margin-top: 10px; margin-left: 6.5px; 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-footer {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  /* при желании можно сделать полупрозрачным/поверх канваса */
}
.unity-mobile #unity-footer { display: none }
#unity-logo-title-footer { float:left; width: 102px; height: 38px; background: url('unity-logo-title-footer.png') no-repeat center }
#unity-build-title { float: right; margin-right: 10px; line-height: 38px; font-family: arial; font-size: 18px }
#unity-fullscreen-button { cursor:pointer; float: right; width: 70px; height: 69px; background: url('fullscreen-button.jpg') no-repeat center }
#unity-warning { position: absolute; left: 50%; top: 5%; transform: translate(-50%); background: white; padding: 10px; display: none }