
How to Remove Space That Appears Below Comment Form
- Go to Your Blogger Account Dashboard > Design > Edit HTML
- Check "Expand Widget Templates" box

- Search This code (Hint: press CTRL+F keys from your keyboard and copy-paste this code)
<a expr:href='data:post.commentFormIframeSrc' id='comment-editor-src'/>
- Just below searched code, you will get an iframe code which will look like this
<a expr:href='data:post.commentFormIframeSrc' id='comment-editor-src'/>
<iframe allowtransparency='true' class='blogger-iframe-colorize blogger-comment-from-post' frameborder='0' height='410' id='comment-editor' name='comment-editor' src='' style='display: none' width='100%'/>
<b:else/>
<h4 id='comment-post-message'><data:postCommentMsg/></h4>
<p><data:blogCommentMessage/></p>
<data:blogTeamBlogMessage/>
<a expr:href='data:post.commentFormIframeSrc' id='comment-editor-src'/>
<iframe allowtransparency='true' class='blogger-iframe-colorize blogger-comment-from-post' frameborder='0' height='410' id='comment-editor' name='comment-editor' src='' width='100%'/>
<iframe allowtransparency='true' class='blogger-iframe-colorize blogger-comment-from-post' frameborder='0' height='410' id='comment-editor' name='comment-editor' src='' style='display: none' width='100%'/>
<b:else/>
<h4 id='comment-post-message'><data:postCommentMsg/></h4>
<p><data:blogCommentMessage/></p>
<data:blogTeamBlogMessage/>
<a expr:href='data:post.commentFormIframeSrc' id='comment-editor-src'/>
<iframe allowtransparency='true' class='blogger-iframe-colorize blogger-comment-from-post' frameborder='0' height='410' id='comment-editor' name='comment-editor' src='' width='100%'/>

- Change the Highlighted height size from 410 to 260. Changing height to 260 will completely remove the white space that appears below the blogger comment form however you can play around with it until you are happy.
- Save Your Template, That's it !