body {
  margin: 0;
  background: #eee;
}

/* h3 {
	color: yellow;
} */

h4 {font-weight:normal;}

.nav-bar {
  position: sticky;
  top: 0;
  background: black;
  color: white;
  padding: 11px;
  font-size: 22px;
  z-index: 10;
  text-align: center;
}

.collection {
	font-size: 18px;
	/* font-family: arial;  */
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1fr;
  grid-gap: 10px;
  padding: 11px;
  margin: auto;
  max-width: 1200px;
}

.flip-card {
  background-color: transparent;
  height: 200px;
  perspective: 1000px;
}

.flip-card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  text-align: center;
  transition: transform 0.6s;
  transform-style: preserve-3d;
  box-shadow: 0 4px 8px 0 rgba(0,0,0,0.2);
	border-radius: 15px; 
  /* border: 3px solid green; */
}

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

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

.flip-card-front, .flip-card-back {
	user-select: none;
	-webkit-user-select: none;
  position: absolute;
  display: grid;
  align-content: center;
  width: 100%;
  height: 100%;
	padding: 7px;
	box-sizing: border-box;
  backface-visibility: hidden;
	border-radius: inherit;
}

.flip-card-front {
  background-color: #d95000;
  color: white;
}

.flip-card-back {
  background-color: #ff6a00;
  color: black;
  transform: rotateY(180deg);
}

@media only screen and (max-width: 600px) {
  .collection {
    grid-template-columns: 1fr;
  }
}