body.dark-theme {
	background-color: #222;
	color: #ccc;
}

body.dark-theme .form-control {
	color: #ddd;
}

.dark-theme .form-control, .dark-theme .card {
	background-color: #444;
	border-color: #555;
}

div.drop-area {
	width: 100%; height: 100px; border: 1px solid #222; border-radius: 10px;
}


.menu-flip-card {
  background-color: transparent;
  perspective: 1000px;
/*  height: 400px;*/
}

.menu-flip-card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.8s;
  transform-style: preserve-3d;
  backface-visibility: hidden;
}

.menu-flip-card.doflip .menu-flip-card-inner {
  transform: rotateY(180deg);
}



.flip-card {
  background-color: transparent;
  perspective: 1000px;
  height: 400px;
}

.flip-card.small-card.match-card {
  height: 100px;
}

.flip-card.selected .card {
  border: #ABDAFC solid 3px;
  border-radius: 5px;
}

.flip-card.small-card {
  height: 200px;
}

.flip-card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.8s;
  transform-style: preserve-3d;
}

.flip-card.doflip .flip-card-inner {
  transform: rotateY(180deg);
}

.flip-card-front, .flip-card-back {
  position: absolute;
  width: 100%;
  height: 100%;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
}

.light-theme .flip-card-front, .light-theme .flip-card-back {
  background-color: #E9EBED;
}

.dark-theme .flip-card-front, .dark-theme .flip-card-back {
/*  background-color: #44515A;*/
}

.flip-card-back {
  transform: rotateY(180deg);
}

.select-button {
  width: 100%;
  height: 200px;
  font-weight: bold;
}

.flip-card .audio-button {
  position: absolute;
  bottom: 15;
  right: 15;
}

.dark-theme .flip-card .audio-button {
  background-color: #333;
  border-color: #333;
}

.light-theme .flip-card .audio-button {
  background-color: #ccc;
  border-color: #ccc;
  color: #222;
}


.tooltip-button {
  position: relative;
}

.tooltip-button::after {
  background-color: #333;
  border-radius: 10px;
  color: #ddd;
  display: none;
  padding: 10px 15px;
  position: absolute;
  text-align: center;
  z-index: 999;
}

.tooltip-button:hover::after {
  display: block;
}

.tooltip-button::after {
  bottom: 0;
  left: 50%;
  transform: translate(-50%, calc(100% + 10px));
}


.tooltip-button.sort-button::after { content: 'Sort cards in alphabetic order' }
.tooltip-button.shuffle-button::after { content: 'Shuffle cards in random order' }
.tooltip-button.flip-button::after { content: 'Flip all cards upside down so that the reverse is up' }