Change menu colors

Hi,

Looked around on the forum and found this, but only the first one seems to work.
Please see http://www.groenwerkensierbestrating.nl. Any suggestions?
What I would like is a darkgrey menu, when you hover green and current page also green

Please add this on your custom.css to change the menu color

.main_menu a {
color: white !important;
}

To change the active page color, use this

.current-menu-item > a {
color: black !important;
}

For the submenu hover, you can use this

.header_color .main_menu .menu ul li a:hover {
background-color: white;
color: orange !important;
}