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The border is caused by the fieldset in each template page in your theme. You can change them like this:
use an inline style in your theme templates like this:
<fieldset style="border: 0px;"> template content fieldset>
Or you could add this to style.css
fieldset.custom {
border: 0px solid #fff;
}
Then in your templates change them to this:
<fieldset class="custom"> template content fieldset>
you could also use the above to customize your fieldset so it is diff from default. as a rule, try not to use inline styling.
Added to FAQ