Card-Flip/styles.css at master · some-casual-coder/Card-Flip · GitHub

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* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}

body {
    height: 100vh;
    /* display: flex; */
    background: #060AB2;
}

.memory-game {
    width: 640px;
    height: 640px;
    margin: auto;
    display: flex;
    flex-wrap: wrap;
    perspective: 1000px;
}


/* Note: don't leave out the space after the minus operation. It causes an error that takes too long to find */

.memory-card {
    width: calc(25% - 10px);
    height: calc(33.333% - 10px);
    margin: 5px;
    position: relative;
    transform: scale(1);
    box-shadow: 1px 1px 1px rgba(0, 0, 0, .3);
    transform-style: preserve-3d;
    transition: transform .5s;
}

.memory-card:active {
    transform: scale(0.95);
    transition: transform .2s;
}

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

.front-face,
.back-face {
    position: absolute;
    height: 100%;
    width: 100%;
    border-radius: 5px;
    padding: 20px;
    background-color: #1c7ccc;
    backface-visibility: hidden;
}

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