You can do it using a code like the following one:
In this way you can later insert an H3 tag to have that effect. You can also set a MARGIN-RIGHT value to limit the width of the line.
font-family:Verdana, Arial, sans-serif;
If you don't want to modify the definition of a header (level 3 in this case), you can define a class (.TITLE) and then refer to it using the appropriate property in the desired tag.
i.e. <P CLASS="TITLE">