How to get that div id="left" has height equal like divs right_up and right_down together ?
<div style="width: 1050px;">
<div id="left" style="width: 80%;height:80%;min-height: 80%;float: left; background-color: blueviolet;">a</div>
<div id="right_up" style="width: 20%;height:40%;min-height: 40%; float: left; background-color: yellow;">
<p>some text using paragraphs</p><p>some text</p>
<ul>
<li>some text using lists</li>
<li>some text</li>
</ul>
</div>
<div id="right_down" style="width: 20%;min-height: 40%;height:40%; float: left; background-color: aqua; margin-left: 80%;">
<p>some text using paragraphs</p><p>some text</p>
<ul>
<li>some text using lists</li>
<li>some text</li>
</ul>
</div>
</div>