.playing-field {
    margin: auto;
}

.tile {
    width: 50px;
    height: 50px;
}

.front {
    width: 100%;
    height: 100%;
    background-color: black;
}

.back {
    width: 100%;
    height: 100%;
    background-color: black;
}

.small-text {
    font-size: x-small;
}

.img-tile {
    max-width: 50px;
    max-height: 50px;
}

/*From: https://davidwalsh.name/css-flip */
.flip-container {
    perspective: 1000px;
    transform-style: preserve-3d;
}

/*  UPDATED! flip the pane when hovered */
.flip .back {
    transform: rotateY(0deg);
}

.flip .front {
    transform: rotateY(180deg);
}

.flip-container,
.front,
.back {
    width: 50px;
    height: 50px;
}

/* flip speed goes here */
.flipper {
    transition: 0.6s;
    transform-style: preserve-3d;
    position: relative;
}

/* hide back of pane during swap */
.front,
.back {
    backface-visibility: hidden;
    transition: 0.6s;
    transform-style: preserve-3d;
    position: absolute;
    top: 0;
    left: 0;
}

/*  UPDATED! front pane, placed above back */
.front {
    z-index: 2;
    transform: rotateY(0deg);
}

/* back, initially hidden pane */
.back {
    transform: rotateY(-180deg);
}

/* 
	Some vertical flip updates 
*/
.vertical.flip-container {
    position: relative;
}

.vertical .back {
    transform: rotateX(180deg);
}

.vertical.flip-container:hover .back {
    transform: rotateX(0deg);
}

.vertical.flip-container:hover .front {
    transform: rotateX(180deg);
}