.header{
    background-color: #f9f9f9;
    justify-content: space-between;
    display: flex;
    padding-left: 3rem;
    padding-right: 3rem; 
    align-items: center;
}

@media screen and (max-width: 780px) {
    .header{
        padding: 0 5rem;
        flex-direction: column;
    }
}

@media screen and (max-width: 320px) {
    .header{
        padding: 0 1rem;
    }
}