Don't worry about changing this here, but for future reference: such specific selectors are generally be bad practice in CSS, for performance reasons and also in terms of readability and reusability. In this case, the element has an ID `#map-container` so you can just reference it by that, since it's supposed to be unique.

Have a read through http://csswizardry.com/2012/07/shoot-to-kill-css-selector-intent/ I found it useful for this.