.uc-callbar {
  position: fixed !important;
  left: 50% !important;
  transform: translateX(-50%) !important;

  width: calc(100% - 24px) !important; /* 両端12pxぶん */
  max-width: 1108px !important;         /* ←PC時の最大幅。好みで 360/420/480 */
  
  bottom: calc(24px + env(safe-area-inset-bottom)) !important;
  z-index: 999999 !important;
}