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The CSS takes a “mobile first” approach in this template, meaning that the default styles make the layout look nice at the skinniest, linear proportions. Your default menu style is therefore the mobile version/layout.
As you’re new to CSS, you should probably research “mobile first” and “media queries” to help you get started.
You should also look into using the developer toolbar – F12 in most browsers. You can use it to explore the DOM, check which styles are applied to each element, see which stylesheet they’re located in, and make live CSS edits in the browsers. It will be your bread and butter for troubleshooting.