When building a Sphinx document, you may encounter unwanted spaces in the resulting HTML code. For example, if you have code blocks with multiple lines, the output may include extra spaces between lines. To remove these unwanted spaces, you can use a combination of HTML entities andCSS rules. In your markdown file, use the code block syntax to format your code, and then use the following HTML entities to remove any extra spaces: , , and . Additionally, you can use CSS to style your code blocks and remove any unnecessary spaces. By using these methods, you can ensure that your Sphinx output is free of unwanted spaces and looks professional and clean.