.index {
    display: flex;
    flex-direction: column;

    justify-content: space-evenly;
    align-items: center;
    text-align: center;

    min-height: 100vh;
}

@media only screen and (max-width: 639px) {
    .index h1 {
        font-size: 5rem;
    }

    .index h2 {
        font-size: 1.5rem;
    }
}

@media only screen and (min-width: 640px) {
    .index h1 {
        font-size: 10rem;
    }
    
    .index h2 {
        font-size: 2.5rem;
    }
}