You get that because the other classes you are calling (block*) have their own CSS associated with the class.
Code:
<div class="blockbody" style="width: 1000px; margin-left:auto; margin-right: auto; padding: 10px;">
<div class="blockrow">
CSS is really not that hard to learn and then you wouldn't have to rely on others to fix any styling issues that come up on your site.