html, body {
    height: 100%;
    margin: 0;
}

body {
    background-color: rgb(20, 20, 20);
    align-items: center;
    justify-content: center;
    display: flex;
    font-family: 'Courier New', Courier, monospace;
    font-size: 2vmin;
    color: white;
}

.gamefield {
    border: 0.2vh solid rgb(100, 100, 100);
}

#playfield {
    z-index: 1;
}

#grids {
    position: absolute;
    z-index: 0;
}

.screen {
    display: none;
    position: absolute;
    z-index: 2;
    height: 100%;
    width: 100%;
    background-color: rgba(30, 30, 20, 0.6);
    text-align: center;
    font-size: 7vh;
}

.menu {
    position: relative;
    top: 23vh;
    margin: auto;
}

#score {
    font-family: 'Courier New', Courier, monospace;
    font-size: 3vh;
}

.button {
    display: block;
    margin: 3vh auto;
    border: none;
    background-color: transparent;
    color: white;
    font-family: 'Courier New', Courier, monospace;
    font-size: 3.5vh;
}

.menu button:hover {
    color: lightgrey;
}

::selection {
    background: transparent;
}