[html] Border Height on CSS

For td elements line-height will successfully allow you to resize the border-height as SPrince mentioned.

For other elements such as list items, you can control the border height with line-height and the height of the actual element with margin-top and margin-bottom.

Here is a working example of both: http://jsfiddle.net/byronj/gLcqu6mg/

An example with list items:

li { 
    list-style: none; 
    padding: 0 10px; 
    display: inline-block;
    border-right: 1px solid #000; 
    line-height: 5px; 
    margin: 20px 0; 
}

<ul>
    <li>cats</li>
    <li>dogs</li>
    <li>birds</li>
    <li>swine!</li>
</ul>