title_body: How to change text alignment with Calibre book editor
upvoted_answer: You can use a CSS style to apply this formatting to all your text:
  
  body {
      text-align: left;
  }
  
  
  This rule will be applied to all your text, so it will affect both regular paragraphs (&lt;p&gt; and &lt;div&gt;) and headings (&lt;h1&gt;, &lt;h2&gt; and so on).
  
  If you just want to format "regular" text you could try to apply this styling just to &lt;p&gt;'s and see if it is sufficient:
  
  p {
      text-align: left;
  }
  
  
  Of course, if some custom style is already present for these elements, you can just add the CSS properties to the existing selectors.
  
  You must place this code inside the CSS stylesheet. Usually it is named stylesheet.css (but it can be different) and you can find it on the left "File Browser" panel under the "Styles" voice