@import url('https://fonts.googleapis.com/css2?family=Righteous&display=swap');

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

body{
    font-family: 'Righteous', 'sans-serif';
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #c7cdd3;
}

.card{
    width: 100px;
    height: 100px;
    position: relative;
    transform-style: preserve-3d;
    transition: transform .5s;
}

.card_back, .card_front{
    width: 100%;
    height: 100%;
    position: absolute;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 20px;
    box-shadow: 10px 10px 10px rgba(0, 0, 0, .45);
    backface-visibility: hidden;
}

.flip{
    transform: rotateY(180deg);
}


.card_front{
    transform: rotateY(180deg);
    background-color: #101c2c;

}

.card_back{
    color: #101c2c;
    background-color: #05c3ff;
    font-size: 30px

}


#gameOver{
    position: absolute;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, .9);
    color: white;
    font-size: 50px;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    display: none;
    top: 0;
}

#restart{
    padding: 20px;
    font-size: 20px;
    background-color: yellow;
    border: none;
    border-radius: 10px;
    margin-top: 10px
}


#gameBoard{
    max-width: 700px;
    display: grid;
    grid-template: 1fr 1fr 1fr 1fr 1fr / 1fr 1fr 1fr 1fr;
    gap: 20px;
}