/**
 * https://www.w3schools.com/howto/tryit.asp?filename=tryhow_css_flip_card
 */

:root {
  --avatar-size: 200px;
}

img .img-thumbnail-avatar {
  width:  var(--avatar-size)
  height: var(--avatar-size);
}

.img-thumbnail-avatar {
  padding: 2px;
  border: 1px solid var(--color) !important;
  background-color: 1px solid var(--color) !important;
}

.flip-card {
  background-color: transparent;
  width:  var(--avatar-size);
  height: var(--avatar-size);
  perspective: 1000px;
}

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

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

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

.flip-card-front {
  background-image: url("../img/tile.png");
  color: black;
}

.flip-card-back {
  background-image: url("../img/tile.png");
  color: var(--color);
  transform: rotateY(180deg);
  border: 1px solid var(--color);
  text-align: center;
}