How To Add Hamburger Menu on Mobile

Site URL: https://www.thenativecoffeecompany.com

I am trying to add a Hamburger menu to my mobile site. Right now on my desktop I added a button entitled, "Menu" that links to a separate page that I am using as a menu page (https://www.thenativecoffeecompany.com/menu). On the mobile site, neither the button nor a hamburger menu show up...I am trying to add a simple hamburger menu on mobile that links to this menu page. 

Add to Design > Custom CSS

.burger-box div {
    display: block !important;
}
.burger-box div div {
    background: white !important;
}

Quote

.burger-box div {
    display: block !important;
}
.burger-box div div {
    background: white !important;
}

@tuanphan - Thanks! This added the hamburger menu. 2 other questions.

1. How do I like the hamburger menu to go to my menu page (https://www.thenativecoffeecompany.com/menu)

2. How do I make the hamburger menu color responsive to the background (some pages would need to be black (on lighter backgrounds) and some need to be white (on darker backgrounds)