.tiles {
    display: grid;
    grid-template-columns: repeat(auto-fill, 400px);
    gap: 1rem;
    justify-content: center;
}

.tile {
    padding: 1rem;
    box-sizing: border-box;
    border: 1px solid;
    text-align: center;
    border-radius: 15px;
}

.tile h3 {
    margin-top: 0px;
    font-size: 1.6rem;
}