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

body 
{
    height: 100vh;
    background: lightblue;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

#Screen-Header
{
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1%;
    background: black;
}

#Screen-Top
{
    display: flex;
    flex-direction: column;
    align-items: center;
    margin: auto;
    background: lightblue;
    border-radius: 5px;
    border: 4px solid rgb(251, 217, 222);
    padding: 1%;
}

.center
{
    margin: auto;
}

.memory-game
{
    border: 2px solid lightblue;
    width: 800px;
    height: 90vh;
    display: flex;
    flex-wrap: wrap;
    margin: auto;
    perspective: 1000px;
    padding: 1%;
}

.memory-card
{
    border: 3px solid black;
    width: calc(25% - 10px);
    height: calc(33.333% - 10px);
    position: relative;
    margin: 5px;
    cursor: pointer;
    transform: scale(1);
    transform-style: preserve-3d;
    transition: transform.5s;
}

.memory-card:active
{
    transform: scale(.95);
    transition: transform.2s;
}

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

.front-face, .back-face
{
    border: 2px solid pink;
    height: 100%;
    width: 100%;
    position: absolute;
    object-fit: fill;
    border-radius: 5px;
    padding: 20px;
    background: rgb(251, 217, 222);

    backface-visibility: hidden;
}


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