body{
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100%;
    background-image: linear-gradient(to right,  #076585, #fff);
    user-select: none;
}

.container{
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 30px;
    background-color: blanchedalmond;
    border-radius: 20px;
    padding: 40px 60px;
}

h2{
    font-size: 3em;
    color: #14213D;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.reset{
    padding: 15px 20px;
    width: 100%;
    background-color:#fff;
    color: #14213D;
    border: none;
    font-family: Helvetica;
    font-size: 1.5em;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    cursor: pointer;
    font-weight: 600;
}

.reset:focus{
    color: pink;
    background-color: #14213D;
}

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

.items{
    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;
}

.items::after{
    content: "";
    position: absolute;
    inset: 0;
    background: #404040;
    transition: 0.25s;
    transform: rotateY(0deg);
    backface-visibility: hidden;

}

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

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