body {
    margin: 0;
    background-color: #000;
    font-family: Arial, Helvetica, sans-serif;
}

a {
    color: #13377d;
    text-decoration: none;
}

p {
    grid-column: 1 / 4;
    grid-row: 1 / 4;
    margin: 0;
    text-align: center;
    color: #fff;
    font-size: 12vw;
    display: flex;
    justify-content: center;
    align-items: center;
}

#main {
    width: 100vw;
    height: 100vh;
    grid-gap: 1vh 1vh;
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    grid-template-rows: 1fr 1fr 1fr 1fr 1fr;
}

.cell, #add {
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 12vw;
    font-weight: bold;
    background-color: #ffcd33;
    color: #13377d;
    overflow: hidden;
}

#add {
    cursor: pointer;
}

.unsaved {
    color: #f00;
}

@media (min-aspect-ratio: 16/9) {
    p, .cell, #add {
        font-size: 20vh;
    }
}