@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700;800;900&display=swap');

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

html {
    font-size: 62.5%;
}

body {
    font-size: 2rem;
    font-family: 'Poppins', sans-serif;
    text-align: center;
    background-color: #f0f0f0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.bingo-board {
    width: 90%;
    max-width: 60rem;
    height: 90%;
    max-height: 80rem;
    margin: 0 auto;
    padding: 3rem;
    background-color: #1A73E8;
    border: .1rem solid #fff;
    border-radius: 2rem;
    box-shadow: 0 0 1rem rgba(0, 0, 0, 0.1);
}

th, td {
    width: 20%;
    height: auto;
    line-height: 5rem;
    text-align: center;
    font-weight: bold;
}

th {
    font-size: 10rem;
    font-weight: bolder;
    color: #eee;
    padding-bottom: 2rem;
}

td {
    font-size: 4rem;
    background-color: #eee;
    border: .1rem  solid #fff;
    cursor: pointer;
    transition: all ease .3s;
}

.angled-cell {
    transform: rotate(-45deg);
    transform-origin: center;
}

td:hover {
    background: #E92531;
    color: #fff;
    transition: all ease .3s;
}

@media (max-width: 660px) {
    html {
        font-size: 60%;
    }
    
    .bingo-board {
        width: 95%;
        min-height: 50rem;
        height: auto;
        padding: 1rem;
    }

    th {
        font-size: 8rem;
        padding-bottom: 1rem;
    }

    td {
        font-size: 2.5rem;
    }
}