How is the dropdown-menu hidden?


Hi! I have been looking through the CSS and trying to figure out how the dropdown menu starts out in a hidden state. I looked through the CSS and the only place where I could find "display: none" is for the slide class.



In your index.html you are loading
bootstrap.min.css via a link-Tag

The dropdown-menu is a facility of the bootstrap environment.
To learn
do a google search
dropdown menu

++ bootstrap
We now have .col-xs (phones), .col-sm (tablets), .col-md (desktops), and .col-lg (large desktops).