* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    background: linear-gradient(-45deg, #7d0d56, #37128c, #861169, #3b128e);
    background-size: 400% 400%;
    animation: gradient 10s ease infinite;
    min-height: 100vh;
}

@keyframes gradient {
	0% {
		background-position: 0% 50%;
	}
	50% {
		background-position: 100% 50%;
	}
	100% {
		background-position: 0% 50%;
	}
}


.container {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    gap: 30px;
    background: linear-gradient(to right, rgba(46, 0, 59, 0.603), rgba(46, 0, 59, 0.603), rgba(46, 0, 59, 0.603));
    padding: 40px 60px;
}

h2 {
    font-size: 2em;
    color: rgba(255, 255, 255, 0.74);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.reset {
    padding: 15px 20px;
    background-color: rgba(255, 20, 251, 0.379);
    color: aliceblue;
    border: none;
    font-size: 0.8em;
    text-transform: uppercase;
    cursor: pointer;
    font-weight: 600;
}

.reset:focus {
    color: #fff;
    background: #3700ff69;
}

.game {
    width: 430px;
    height: 430px;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    transform-style: preserve-3d;
    perspective: 500px;
}

.item {
    position: relative;
    width: 100px;
    height: 100px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 3em;
    background: #ffffff2f;
    transform: rotateY(180deg);
    transition: 0.25s;
}

.item.boxOpen {
    transform: rotateY(0deg);
}

.item::after {
    content: '';
    position: absolute;
    inset: 0;
    background: #7a00b3;
    transition: 0.25s;
    transform: rotate(0.25deg);
    backface-visibility: hidden;
}

.boxOpen:after, .boxMatch:after
{
    transform: rotateY(180deg);
}