site : mls9.de
I changed the colours by copying the red style, it works well but the menu is giving me problems.
When your on the top of page the colour of the main menu items is wrong but the colour if the sebmenu selections is okay (see PIC_01)
If you scroll down on the side the colour of the home button is correct but when you scroll over the other menu items they are not highlighted in the right colour any more (only lighter grey, see PIC_02) the submenu items under features, pages and Joomla are not highlited at all but under mega menu they are (see PIC_03).
I tested the template on your side and it shows the same behaviour.
Thanks a lot for your help.

Add the color manually into the css/custom.css

.uk-sticky-placeholder .uk-active.uk-navbar li li li a:hover {color:#dd9999 !important}

Sorry not working, see attached picture.

Live Url please

mls9.de

1.) Download the file
2.) Copy the theme.less into the template folder > less
3.) After that press compile LESS in template settings