Padding problem in Content

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I created a PHP file from HTML file in order to build the new theme for C5.

I have a difficulty with a padding setting,,,

I wrote CSS, "padding: 0px;" for editable areas but when I add text in C5, there seems to be a room between the top-edge of that area and the point from which added texts actually start. Attached is an reference image.

Below is my details of php, please have a look if needed. I wrote css including padding settings for "content1"

<div class="content1">
<?php
$a = new Area('content1');
$a->display($c);
?>
</div>


Could you tell me how I can add text wihtout any room above the text area?

Kenichi