Weird ul list issue in my case

Question

I am having a weird issue with my ul list

I have something like

        
Slide
        


        
                      

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Answer 1

For default all elements has properties in this case ul:

ul {
  display: block;
  list-style-type: disc;
  margin-before: 1em;
  margin-after: 1em;
  margin-start: 0;
  margin-end: 0;
  padding-start: 40px; 
}

You need to reset those properties : Try

ul {
  margin:0;
  padding:0;
}

Answer 2

The problem is your line-heights. Remove these from #left-nav, #right-nav, and #slide-list li.

Also set the ul's margin to 0 (@Danko's idea).