HTML paragraph tag
<p> represents a paragraph that contains top and bottom margin.This margin is generated by default,commonly known as user agent style.
You have to use the opening paragraph tag
<p> and closing paragraph tag
</p>. So that readability might be better.
<p>This is a paragraph having by default margin.</p>
How To Eliminate By Default Margin Of The ParagraphTips:
Write CSS rule regarding paragraph tag