CSS inconsistency for the Search Form block

In HOME, the Search Form Submit HTML:

<span class="button edit-submit">
    <input type="submit" name="op" id="edit-submit" value="Search" class="form-submit">
</span>

has css:

.form-wrapper .edit-submit {
margin-right: 3px;
}

But in Detailed-Node, the Search Form Submit HTML changed into:

<span class="button edit-submit--2">
  <input type="submit" name="op" id="edit-submit--2" value="Search" class="form-submit">
</span>

Where the object above doesn't get the matching CSS the same as amove.
The change is because of the existence of another submit button (which is in Comment Form Submit button).

The fix is (in form.css):

#search-block-form span.button {
  margin-right: 3px;
}