* {
    box-sizing: border-box;
}

html {
    min-height: 100vh;
}

body {
    margin: 0;
    background: radial-gradient(#33ccff, #009933);
}

.heading-one {
    color: #003d99;
    font-family: Helvetica, serif;
    font-weight: normal;
    text-align: center;
    font-size: 26px;
}

.heading-two {
    color: #003d99;
    font-family: Helvetica, serif;
    font-weight: normal;
    text-align: center;
    font-size: 18px;
}

/*#reset {
    display: flex;
    border: 2px solid black;
    border-radius: 10px;
    color: black;
    text-transform: uppercase;
}
*/

.game-info {
    color: #003d99;
    font-family: Helvetica, serif;
    font-weight: normal;
    text-align: center;
    font-size: 16px;
}

.paintings-container {
    margin: 50px auto;
    display: grid;
    grid-template-columns: repeat(4, auto);
    grid-gap: 12px;
    justify-content: center;
    perspective: 1000px;
}

.card {
    position: relative;
    height: 180px;
    width: 240px;
    transform: scale(1);
    transform-style: preserve-3d;
    transition: transform .5s;
}

.card:active {
    transform: scale(0.97);
    transition: transform .2s;
}

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

/*.card-back {
    visibility: hidden;
}*/

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

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