body{
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: #fc1e8a;
    user-select: none;
}

.container{
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 30px;
    background: linear-gradient(325deg,
     #03001e 0%, 
     #7303c0 30%,
     #ec38bc 70%,
     #fdeff9 100%);
     padding: 40px 60px;
}

h2{
    font-size: 3em;
    color: #fff;
    text-transform: uppercase;
    letter-spacing: 0.1em;

}

.reset{
padding: 15px 20px;
width: 100%;
color: #03001e;
background-color: #fdeff9;
border: none;
font-size: 1.5em;
letter-spacing: 0.1em;
text-transform: uppercase;
cursor: pointer;
font-weight: 600;
}

.reset:focus{
    color: #ec38bc;
    background-color: #2e2a31;
}

.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;
    align-items: center;
    justify-content: center;
    background-color: #fff;

    font-size: 3em;
    transform: rotateY(180deg);
    transition: 0.25s;
}

.item::after{
    content: '';
    position: absolute;
    inset: 0;
    background: #404040;
    /*opacity: 0.85;*/
    transition: 0.25s;
    transform: rotateY(0deg);
    backface-visibility: hidden;
}

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

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