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Resetting your css styles is a good thing to do to ensure that your site is rendered the same on all browsers.

Unfortunately, this often wipes out the default p tag padding and margin. The following style will restore a p to it’s normal margin (it doesn’t have a padding).

Each browser styles the p tag differently, thus this restores it to what it would look like in Firefox, creating a uniform look. Exactly what we’re going for.
p{
margin: 1em 0px;
}

Source

Here’s a link on how to use CSS Style Resets correctly:
Resetting Yoru Styles with CSS Reset