* {
    box-sizing: border-box;
    font-family: 'Rubik Mono One', sans-serif;
}

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

header {
    font-size: 5vmin;
    color: darkviolet;
    letter-spacing: 1vmin;

}

h1 {
    color: dimgray;
    font-size: 3vmin;
    margin-top: 1vmin;
}

#board {
    display: grid;
    grid-template-columns: repeat(3, 20vmin);  
    grid-template-rows: repeat(3, 20vmin);
    gap: 1vmin;
    margin-top: 1vmin;
}

#board > div {
    border-radius: 10%;
    border: 0.1vmin solid grey;
}

button {
    margin-top: 4vmin;
    padding: 2vmin;
    font-size: 2cmin;
    border-radius: 2vmin;
    border: 0.1vmin solid dimgrey;
    color: dimgray;;
}

button:hover {
    color: white;
    background-color: darkviolet;
    cursor: pointer;
}

div {
    font-size: 20vmin;
    text-align: center;
    line-height: 22.5vmin;  
}

div:hover {
    cursor: pointer;
    transform: scale(1.1);
    transition: transform 158ms ease-in;
}