gaia-overflow-menu {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  /* Same as titlebar */
  z-index: 1001;
  padding: 11.4rem 3rem 0;
  background-color: rgba(231, 231, 231, 0.6);
  transition: opacity var(--transition-duration);
  pointer-events: auto;
  box-sizing: border-box;
}

gaia-overflow-menu.hidden {
  display: none;
}

gaia-overflow-menu.showing {
  background-color: transparent;
}

/* XXX Possibly a Gecko bug, if you don't specify this pseudo-element, the
 *     animation set on it below won't re-play subsequent times.
 */
gaia-overflow-menu::before {
  content: '';
}

gaia-overflow-menu.showing::before {
  position: absolute;
  top: 0;
  offset-inline-end: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(231, 231, 231, 0.6);
  will-change: transform;

  animation-name: grow;
  animation-duration: var(--transition-duration);
}
:-moz-dir(ltr) gaia-overflow-menu.showing::before {
  transform-origin: 100% 0;
  border-radius: 0 0 0 100%;
}
:-moz-dir(rtl) gaia-overflow-menu.showing::before {
  transform-origin: 0 0;
  border-radius: 0 0 100% 0;
}

gaia-overflow-menu.hiding {
  opacity: 0;
}

gaia-overflow-menu.showing > * {
  opacity: 0;
}

gaia-overflow-menu button {
  display: block;
  width: 100%;
  height: 5rem;
  background-color: white;
  border: 0.1rem solid rgba(189, 189, 189, 0.1);
  border-bottom: none;
  border-radius: 0;
  box-sizing: border-box;

  padding: 0;
  background-position: 0.75rem center;
  background-repeat: no-repeat;

  font-size: 1.6rem;
  font-style: italic;
  font-weight: 500;
  color: #00aac5;
  white-space: nowrap;
  text-overflow: ellipsis;
  -moz-user-select: none;

  transition: opacity 0.2s;
}
gaia-overflow-menu:-moz-dir(ltr) button {
  padding-left: 6rem;
  text-align: left;
}
gaia-overflow-menu:-moz-dir(rtl) button {
  padding-right: 6rem;
  text-align: right;
}

gaia-overflow-menu button:active {
  background-color: #e7e7e7;
}

gaia-overflow-menu button:last-child {
  border-bottom: 0.1rem solid rgba(189, 189, 189, 0.1);
}

gaia-overflow-menu button[hidden] {
  display: none;
}