Hi. I can't change the hamburger Menù color on offcanvas. Could you please indicate me how to change its color? Thanks!

Add this code to your css/custom.css to override the menu icon color:

.uk-navbar-toggle {
color: #222222;
}

Sorry, I'm not so advanced...
1. I created a file called custom.css on CSS folder
2. I edited css/custom.css and entered the code you indicated me

Now, how can'I tell Joomla to use my custom.css file? How can I create override off theme.css?

Thank you for your pacience!

You can change the color HEX code in your created custom.css

#222222 = dark
#FFF = white
#FF0000 = red