*{
    box-sizing: border-box;
}
.memory-game{
    width: 45vw;
    height: 78vh;
    display: flex;
    flex-wrap: wrap;
    margin: auto;
    perspective: 1000px;
}
.memory-card{
    position: relative;
    width: calc(25% - 10px);
    height: calc(25% - 10px);
    margin: 5px;
    transform: scale(1);
    transform-style: preserve-3d;
    transition: transform .5s;
}
.memory-card:active{
    transform: scale(.92);
    transition: transform .2s;
}
.memory-card.flip{
    transform: rotateY(180deg);

}
.front-face , .back-face{
    position: absolute;
    border: 2px solid deeppink;
    width: 100%;
    height: 100%;
    padding: 20px;
    border-radius: 5px;
    background: blue;
    backface-visibility: hidden;
}
.front-face{
    transform: rotateY(180deg);
}
img{
    width: 80px;
}

.content{
    background: rgb(251, 255, 0);
    width: 600px;
    margin: auto;
    border-radius: 5px;
    padding: 6px;

}
.content h3,h2{
    display: flex;
    justify-content: space-around;

}

.txt{
    font-size: 30px;
    width: 500px;
    margin:auto;
    background: darkorange;
    border-radius: 10px;
    padding: 20px;
    text-align: center;
}
.txt button{
    width: 80px;
    margin: auto;
    height: 30px;
    background-color: darkorchid;
}

.newtx {
    position: absolute;
    width: 40%;
    left: 24%;
    height: 30%;
    top: 35%;
    z-index: 1;
}

.fadecard{
    opacity: .5;
}