I have been using the cPanel HTML editor for several years to do minor editing to my website. Recently, it stopped rendering the pages correctly so using it becomes impossible. This was apparently caused by a recent update to cPanel. My webhoster suggests I just use a local editor, which is too much hassle for what I need it for. So, I'm trying to figure out how I can just get back to where I was with the cPanel HTML editor. I've attached a picture of how the page displays. The problem appears to be with the style sheet, which is included herewith.

Thanks for any assistance.

What's happening is that everything below the header is the same color as the background and the footer is appearing on the same line as the header on the right side of the page.
Click image for larger version. 

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Code:
body  {
	font: 100% Arial,Verdana, Helvetica, sans-serif;
	background-color: #415065;
	margin: 0; /* it's good practice to zero the margin and padding of the body element to account for differing browser defaults */
	padding: 0;
	text-align: center; /* this centers the container in IE 5* browsers. The text is then set to the left aligned default in the #container selector */
	background-image:url(images/body_bg_tile.jpg);
	background-repeat:repeat-x;
	background-position:top left;
	color: #333333;
	font-size:14px;
}
.chart_container{
	text-align:center;
	float:right;
}
.chart{
	margin:0 0 10px 15px;
	border:1px solid #8FB8D8;
	padding:2px;
	background-color:#E9E9E9;
}
div.markee {display: inline}
#container { 
	width: 860px;  
	background: #FFFFFF;
	margin: 0 auto; /* the auto margins (in conjunction with a width) center the page */
	border: 3px solid #e9e9e9;
	text-align: left; /* this overrides the text-align: center on the body element. */
}
.box {
	padding-right: 100px;
	margin: 10px 10px 10px 10px;
}
#copyright{
	font-size:10px;
	text-align:center;
	margin:5px 0px;
	padding:0;
}
#form_left{
	float:left;
	width:250px;
}
#form_right{
	float:left;
	width:300px;
	margin-bottom:60px;
}
h1, h2{
	color:#415065;
	font-size:18px;
	background-image:url(images/h1_line.jpg);
	background-repeat:no-repeat;
	background-position:bottom left;
	padding-bottom:7px;
	margin-top:0;
	font-style:italic;
	text-transform: uppercase;
} 
#header {
	width:100%;
	background-image:url(images/header_tile.jpg);
	background-repeat:repeat-x; 
	background-color: white;
} 
#header h1 {
	margin: 0; /* zeroing the margin of the last element in the #header div will avoid margin collapse - an unexplainable space between divs. If the div has a border around it, this is not necessary as that also avoids the margin collapse */
	padding: 10px 0; /* using padding instead of margin will allow you to keep the element away from the edges of the div */
}
#left_column{
	width:140px;
	float:left;
}
#links_menu{
	font-size:13px;
	margin-left:10px;
	width:140px;
	float:left;
}
#links_menu a:hover{
	color:#415065;
}
#mainContent {
	width:675px;
	float:left; 
	padding-left:20px;
}
#mainContent p{
     line-height:1.1;
	
}
#footer { 
	margin:30px 10px 0px 10px;
	padding:0;
	background:#B6CEFF; 
} 
#footer p {
	margin:0;
	padding:4px 0px 4px 20px;
	font-size:12px;
	text-align:center;
}
#footer a {
	color:#415065;
}
#footer a:hover {
	color:#88B8DE;
}
.fltrt { /* this class can be used to float an element right in your page. The floated element must precede the element it should be next to on the page. */
	float: right;
	margin-left: 8px;
}
.fltlft { /* this class can be used to float an element left in your page */
	float: left;
	margin-right: 8px;
}
.clearfloat { /* this class should be placed on a div or break element and should be the final element before the close of a container that should fully contain a float */
	clear:both;
    height:0;
    font-size: 1px;
    line-height: 0px;
}
.red{
	color:red;
}
.trading_table{
	font-size:12px;
	border-collapse:collapse;
}
.vertical, .horizontal {
	background-color:#F5F5F5;
}
#month{ 
	border-width:3px; 
	border-style: solid; 
	border-collapse:collapse; 
	border-color:#415065; 
	background-color:#B6CEFF; 
	width:600px;
	cellpadding:2px; 
	cellspacing:2px; 
	font-weight: bold;
	}
<!--
table.month th {
	font-weight: bold;
	border-width: 1px;
	padding: 2px;
	border-style: solid;
	border-color: #000000;
}
table.month td {
	font-weight: bold;
	border-width: 1px;
	padding: 2px;
	border-style: solid;
	border-color: #000000;
}
-->
<!--th,td { border-width:1px; border-collapse:collapse; border-style:solid; border-color:#000000; text-align:center }-->

<!--[if IE 5]>
<style type="text/css"> 
/* place css box model fixes for IE 5* in this conditional comment */
.twoColFixLtHdr #sidebar1 { width: 230px; }
</style>
<![endif]--><!--[if IE]>
<style type="text/css"> 
/* place css fixes for all versions of IE in this conditional comment */
.twoColFixLtHdr #sidebar1 { padding-top: 30px; }
.twoColFixLtHdr #mainContent { zoom: 1; }
/* the above proprietary zoom property gives IE the hasLayout it needs to avoid several bugs */
</style>
<![endif]-->