Button change color on click

Hello,
Can anyone please help me?
I am using thid theme http://smthemes.com/luxero/, and i need some help to modify secondary menu(in my example you can find it in top-left corner) buttons, so that they stay red when i click on one of them , so that visitors can know on what page their are.
I hope you understood what i want, please excuse my english.

Hi!
You can add the following code to the file style.css:

.current-menu-item {
		background:#c50000;
	}

to highlight the menu item you are visiting. Of course, you can add anything else.