In postbit or postbit_legacy, you have to find the "$post[message]" variable, and surround it with the following <div> tag:
<div id="post_message_$post[postid]" style="overflow:auto; width:100%;"></div>
The overflow style will make it so that if the post width exceeds the 100% width limit, it will automatically add a horizontal bar which will scroll to the excess content.
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