Excerpt font size

Hello Alan ! 
To set a custom font size for the excerpt only in the DW Focus, You need to specify different classes in your CSS. For instance: you can make a p.test1 and a p.test2 each with different css attributes. E.g: 

p.test1 {font-size:18px;)
p.test2 {font-size:28px}

Then, just call which one you want to use while posting. For instance:<p class=”test1″>This is my text</p> Or <p class=”test2″>This is my text</p>

See the screesnhot: 
Hope this helps !