Create an underline that stretches the whole width of the container, whilst the actual text within the paragraph does its usual thing. Whilst this could be easily achieved with a background image and some careful line-height adjustment, if you resize the text with browser buttons the text will increase but the background image would stay the same. However, if you use an image in the foreground and inline style to size it, it will stretch appropriately. Because IE rendering is iffy, you may prefer to use *html .lineunder {display: none; } to hide the lines, especially for long paragraphs.