Style for the content area will be used to encompass your article Style for the content title will be applied to your article title Style for the read more link will be applied to your read more link (if you have one) You can also set the style of all your links using the Link a field
Here is an example:
<div class="acymailing_content"><a href="{link}" name="flexicontent-{id}" target="_blank" ><h2 class="acymailing_title">{title}</h2></a>{introtext}</div>