body {
    margin: 0;
    padding: 0;
    display: flex;
    height: 100vh;
    justify-content: center;
    align-items: center;
}

@media (orientation: landscape) {
    #game-page {
        flex-direction: row;
    }
    #game-board {
        width: 70vmax;
        height: 90vmin;
    }
    #game-side-panel {
        width: 20vmax;
        height: 90vmin;
    }
}

@media (orientation: portrait) {
    #game-page {
        flex-direction: column;
    }
    #game-board {
        width: 90vmin;
        height: 70vmax;
    }
    #game-side-panel {
        width: 90vmin;
        height: 20vmax;
    }
}

#game-page {
    display: flex;
    flex-wrap: nowrap;
    justify-content: space-evenly;
    align-items: center;
    width: 100%;
    height: 100%;
    position: relative;
}

#game-board {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    border: 5px solid #333;
    background-color: #ddd;
    z-index: 1;
}
#game-board.landscape > .game-card {
    width: 12.5%;
    height: 25%;
}
#game-board.portrait > .game-card {
    width: 25%;
    height: 12.5%;
}

#game-side-panel {
    text-align: center;
    vertical-align: middle;
    content: "";
    display: flex;
    flex-direction: column;
}

.game-card {
    margin: 0px;
    padding: 10px;
    box-sizing: border-box;
    background-size: contain;
    background-origin: content-box;
    background-repeat: no-repeat;
    background-position: center;
    cursor: pointer;
    z-index: 2;
    transition: 0.3s;
    transform-style: preserve-3d;
    background-image: url(./img/reverse.png);
}

@media (max-width: 960px) {
    .game-card {
        padding: 2px;
    }
}   
@media (min-width: 1560px) {
    .game-card {
        padding: 20px;
    }
}