/* The off-canvas mobile menu (mmenu.js) panels report a computed
   width/height of "auto" instead of resolving against their
   position:absolute; top/left/right/bottom:0 box, leaving every
   panel collapsed to 0x0 and invisible. Force explicit sizing. */
.mm-menu .mm-panels,
.mm-menu .mm-panel {
  width: 100% !important;
  height: 100% !important;
}