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

body { position: fixed; height: 100% }

.main-container {
    overflow: auto;
    height: 100%;
    width: 100vw;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2rem; 
}

@media screen and (min-width: 640px) {
    .main-container {
        padding: 1rem 8rem;  
    }
}

.image-container {
    width: 100%;
}