body {
    text-align: center;
    margin: 0 15vw;

    min-height: 100vh;
    display: grid;
    grid-template-rows: auto 1fr auto;
}

.grid-container {
    display: grid;
    margin: auto;
    grid-template-columns: auto auto auto;
    background-color: dodgerblue;
    padding: 10px;
    max-width: 60vw;
    gap: 10px;
}

.grid-container div {
    background-color: #f1f1f1;
    border: 1px solid black;
    padding: 10px;
    text-align: center;
}

footer {
    padding: 10px;
}