The Menu doesn´t appear on mobile

Hello, I have sydney theme, in my web, but the menu in mobile does´t appear.

In fact what appears is some numbers and letters. The web is http://www.vibra-to.com

Thank you

Hello,

I don’t know if you have changed something in css but font awesome icon content is missing back slash https://www.screencast.com/t/Bh6q6iZI3LT so you can add it inside theme style.css or simply apply custom css code below from Appearance > Customize > Additional CSS field and result should look like this https://www.screencast.com/t/v2HlYnLQJji0 :

.btn-menu:before{
		content: "\f0c9";
	}

Best Regards!

Hello,

Thank you for your answer. I tried and put the \ before f0c9, but I had to put it on appearance-edit, because on additional css doesn´t appear anything.

The problem was that after put the , and save, there was no change. In fact, I went again to edit and was without the back slash.

What can I do?

Thank you