Quick CSS not working, not even changing custom.css via FTP

Dear all,

I am trying to remove the search icon and to shift the menu a bit on the right to have more space for menu elements here : http://www.inspirationgroup.it/

I insert the following code in quick CSS but the page does not change:

#top.avia-blank #wrap_all {
display: block;
}

.main_menu{ right: -200px;}

#menu-item-search {
display: none;
}

can you help me?

thanks!