Changing Blogger Font Size for Posts

The font-size, although looked nice, was a little hard to read. The font styling for posts is being set through the "post-body" class so I just changed it from 12px to 13px.

.post-body {
  margin:0 0 .75em;
  line-height:1.6em;
  font-family: "Trebuchet MS",Verdana,Arial,Helvetica,sans-serif;
  font-size: 13px; /*changing 12px to 13px for legibility*/
  color: #666666;
}