how to move sidebar from right to left side. Pool theme.

Hi, I’m using the (modified) Pool Theme and was wondering how I move the sidebar from right to left side. I’m fairly new to CSS so wanted to see if someone knew off bat. I already tried all the ways in searching the forums: https://search.www.ads-software.com/move+sidebar+from+right+to+left

This is the test blog:

https://vanpham.com/blog/

Here is the basic CSS:
=============================

body {
background: url(images/bg.gif);
color: #333;
font-family: “Arial”, “Helvetica”, sans-serif;
margin: 0;
padding: 5px 0;
}

#content {
background: #fff;
border: 1px solid #9C9C9C;
margin: 0 auto;
padding: 5px;
width: 795px;
}

#header {
background: url(https://us.js1.yimg.com/us.yimg.com/i/us/pim/pr/trap/welcomemail/ymail_logo_purple.gif) no-repeat;
height: 50px;
margin: 0;
padding: 0;
}

#pages {
background: #DDE4F7;
font-size: 12px;
margin: 0;
padding: 15px 0 6px 20px;
}

#search {
float: right;
margin: 0;
padding: 0;
position: relative;
right: 10px;
top: -22px;
}

#noticias {
float: left;
margin: 0;
padding: 0 0 20px 20px;
width: 550px;
}

#sidebar {
float: right;
font-size: 11px;
line-height: 1.5em;
margin: 0;
padding: 0 10px;
width: 170px;
}