mobile switch order

Site URL: https://avocado-bagpipe-e9kf.squarespace.com/

password 123 

I'd like to switch order of the blocks   "About Us"  and what appears above it  so that About US appears first on mobile. 

Add to Design > Custom CSS

/* Mobile-About us order */
@media screen and (max-width:640px) {
div#page-60c0b8a7e66016029f33c8d0 .span-12 .span-10 {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: reverse;
        -ms-flex-direction: column-reverse;
            flex-direction: column-reverse;
    margin-top: 20px;
}
}