li 1) is an element that represents a single item in a.
This example shows a ordered list
<ol>
<li>First Element</li> <!-- li = list item -->
<li>Second Element</li>
<li>Third Element</li>
</ol>
If you want to select a li list item, you need to use a child pseudo-selector
This example shows the painting in blue of the second list item
ol > li:nth-child(2){
color: blue;
}
<ol>
<li>First Element</li>
<li>Second Element</li>
<li>Third Element</li>
</ol>
See CSS - list-item (list formatting with marker box)