Logo in the menu still resizes smaller when scrolling

I followed what was said on most important FAQ (theme forest page) and added it to quick CSS but it doesn’t work.
The menu stays fix and keeps the same size, that’s perfect. But the logo still resizes smaller.
Am I wrong somewhere ? Can’t send you the link (working on localhost). Thanks a lot.

#header_main .container, .main_menu ul:first-child > li a, .logo img, .logo a {
height: 100px !important;
line-height: 100px !important;
}

html.fixed_header #main {
padding-top: 100px;
}