CSS height, How to get it to go around inner divs

Tags: html,css

Problem :

Why is it that my border does not go around my inner divs, and my inner div borders do not go to the bottom of the outer div, ( in FF but need this for all major browser).

Can someone please help

<div id="main">
    <div class="insidediv">
        <p>Article 1</p>
    <div class="insidediv">
        <p>Article 2</p>

    <div class="insidediv">
<p>Article 3</p>

    width: 800px;
    height: 100%;
    border: 20px solid black;

    width: 200px;
    height: 100%;
    border-right: 20px solid black;

Solution :

Alter #main to float: left; or overflow:hidden. I recommend the float

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