@media (min-width: 768px) {
  body:not(.global-nav-is-open) .global-navigation {
    display: none; 					// Hide the global navigation when the .global-nav-is-open class is not present on the body
  }
  body:not(.global-nav-is-open) #itrp-backdrop {
    display: none; 					// Hide the backdrop
  }
  body.global-nav-is-open .global-navigation {
    background: white;		// white background color
    display: block; 		// Show the menu
    position: fixed; 		// Fix its position...
    top: 40px; 				// ...to about 40px from the top of the screen (just underneath the hamburger menu)
    z-index: 1000; 			// Put the menu on top of everything.
    min-height: 0;			// no minimal height, just long enough to contain all menu items 
  }
  body.global-nav-is-open #itrp-backdrop {
    display: block; 		// Show the backdrop
    position: fixed; 		// Fix its position...
    top: 0; bottom: 0; left: 0; right: 0; // ... to the entire browser window
    z-index: 999; 			// Put the backdrop on top of everything, except the navigation menu
  }
}

@media (max-width: 767px) { // Only on small screens
  body .global-navigation {
    position: fixed; 		// Fix the navigation menu...
    top: 0; 				// ... to the top of the screen
    width: 14em; 			// Make it 14em wide
    left: -14em; 			// And put it just outside the visible window (so that it is initially hidden)
    transition: transform 300ms;// When the menu is 'transformed', animate the transition for a duration of 300 millisecs
  }
  body.global-nav-is-open .global-navigation { 	// When the menu is open...
    background: white;						// White background color
    color: #40474d;							// And grey text color
    transform: translate3d(14em, 0, 0); 	// ...move the menu 14em to the right, so that it becomes visible.
    min-height: 0;					        // no minimal height, just long enough to contain all menu items 
  }
}