Curious why its not 50%, just stood out when I was looking that the letter was not centered.  Also not sure the line height is needed here (on the h3) since its already defined on the letter_row class? 

Since I'm here, if we want to jazz up the letter a bit, we could use font-awesome, was playing with 
```
				<h3>
					<span class="fa-stack">
						<i class="fa fa-circle fa-stack-2x"></i>
						<i class="fa-stack-1x fa-inverse">', $member['sort_letter'], '</i>
					</span>
				</h3>
``` as an example (would need to tweak the height/line-height on the .letter_row)