How to make sidebar wider

Could anyone help me to edit the css to make the sidebar a little bit wider, here's the css

/********************************************
   AUTHOR:  			Erwin Aligam 
   WEBSITE:   			http://www.styleshout.com/
	TEMPLATE NAME: 	BluePigment
   TEMPLATE CODE: 	S-0016
   VERSION:          1.0	
	DATE:          	July-31-2007
 *******************************************/ 
 
/********************************************
   HTML ELEMENTS
********************************************/ 

/* top elements */
* { padding: 0; margin: 0; border: 0; }

body {
	margin: 0; 	padding: 0;
	font: normal 12px/1.7em  verdana, tahoma, sans-serif;	 
	text-align: center;
	background: #001342 url(images/headerbg.jpg) repeat-x 0 0;
	color: #F2F9FF;
}

.center {
	text-align: center;
}

/* links */
a {
	color: #003366;
	background-color: inherit;
	text-decoration: none;		
}
a:hover {
	color: #FAA34B; 
	background-color: inherit;
	text-decoration: underline;	
	border: none;
}

/* headers */
h1, h2, h3 {
	font: bold 1em 'Trebuchet MS', Tahoma, Arial, Sans-serif;
	color: #fff;
}
h1 { font-size: 2.5em; } 
h2 { font-size: 2em; text-transform:uppercase;}
h3 { font-size: 1.8em; }

p, h1, h2, h3 {
	margin: 0;
	padding: 10px 15px;
}

ul, ol {
	margin: 10px 30px;
	padding: 0 15px;	
}

/* images */
img {
	background: #FAFAFA;
   border: 1px solid #0F7ACC;
	padding: 6px;
}
img.float-right {
   margin: .5em 0 1em 1em;   
}
img.float-left {
   margin: .5em 1em 1em 0;
}

code {
  margin: .5em 0;
  display: block;
  padding: 20px;
  text-align: left; 
  overflow: auto;  
  font: 500 1em/1.5em 'Lucida Console', 'Courier New', monospace ;
  /* white-space: pre; */
  background: #1E89DC;
  border: 1px solid #0065C6;   
}
acronym {
  cursor: help;
  border-bottom: 1px solid #0065C6;
}
blockquote {
	margin: 10px 15px;
 	padding: 10px 0 10px 28px;  
   border: 1px solid #0065C6;
	background: #1E89DC; 
  	font: bold 1.3em/1.5em "Century Gothic", "Trebuchet MS", Helvetica, Arial, Geneva, sans-serif;
}

/* start - table */
table {
	margin: 10px 15px; 
	border-collapse: collapse;			
}
th strong {
	color: #fff;
}
th {
	background: #93BC0C;
	height: 3em;
	padding-left: 12px;
	padding-right: 12px;
	color: #FFF;
	text-align: left;
	border-left: 1px solid #B6D59A;
	border-bottom: solid 2px #8EB200; 
	border-top: solid 2px #8EB200;
}
tr {
	color: #707070;
	height: 2.5em;	
}
td {
	padding-left: 10px;
	padding-right: 10px;
	border-left: 1px solid #FFF;
	border-bottom: solid 1px #ffffff;
}
td.first,th.first {
	border-left: 0px;
}
tr.row-a {
	background: #F8F8F8;
}
tr.row-b {
	background: #EFEFEF;
}
/* end - table */

/* form elements */
form {
	margin: 10px 15px; 
	padding: 10px;
	border: 1px solid #0065C6; 
	background-color: #1E89DC; 
}
.boxed {
	margin: 10px 15px; 
	padding: 10px;
	border: 1px solid #0065C6; 
	background-color: #1E89DC; 
}
fieldset {
	margin: 0;
	padding: 0;
	border: none;
}
label {
	display:block;
	font-weight:bold;
	margin: .4em 0;	
}
input {
	padding: .3em;
	border: 1px solid #eee;
	font: normal 1em Verdana, sans-serif;
	color:#777;
}
input.text {
	background:#dddddd;
}
input.text:focus {
	color:#999;
}
textarea {
	width: 55%;
	padding: .3em;
	font: normal 1em/1.5em Verdana, sans-serif;
	border: 1px solid #eee;
	height: 10em;
	display:block;
	color:#777;
}
input.button { 
	font: bold 1em Arial, Sans-serif; 
	margin: 0;
	padding: .25em .3em;
	color: #FFF;
	background: #A2CC00;
	border: 2px solid #8EB200;
}

/* search form */
.searchform {
	background-color: transparent;
	border: none;	
	margin: 0 0 0 10px; padding: 0 0 1.5em 0;	
	width: 18em;	
}
.searchform p { margin: 0; padding: 0; }
.searchform input.textbox { 
	width: 11em;
	color: #777; 
	padding: .4em; 
	border: 1px solid #E5E5E5;
	vertical-align: top;
}
.searchform input.button { 
	width: 60px;
	vertical-align: top;
}

/***********************
	  LAYOUT
************************/

#header-content, #content, #nav {
/*
The width value below sets the total width of the design. It's default value is set to 93%
which means that it will take up 93% of the browser window's width. You can also set it to a 
different percentage	value (90%, 85%, etc.). This design is fluid layout by default, but you
can turn it into a fixed width layout by setting a pixel value to the width (e.g. 900px, 950px).
*/
	width: 94%;	
}

/* box */
.box {
	margin: 10px 0;	
	padding: 10px 10px 20px 10px;		
	border: 5px solid #1F8ADE;
	background: url(images/boxbg.jpg);		
}

/* header */
#header {
	height: 178px;
	text-align: left;	
}
#header-content {
	position: relative;
	margin: 0 auto; padding: 0;
}
#header-content h1#logo-text a {
	position: absolute;
	margin: 0; padding: 0;
	font: bold 58px 'Trebuchet MS', Tahoma, Arial, Sans-serif;
	letter-spacing: -1px;
	color: #fff;
	text-decoration: none;
	
	/* change the values of top and left to adjust the position of the logo*/
	top: 30px; left: 10px;	
}
#header-content h1#logo-text span {
	color: #68B5F0;	
}
#header-content #slogan {
	position: absolute;	
	font: bold 16px 'Trebuchet Ms', Sans-serif;
	text-transform: none;
	color: #FFF;	
	margin: 0; padding: 0;
	
	/* change the values of left and top to adjust the position of the slogan */
	top: 100px; left: 125px;
}

/* header links */
#header-content #header-links {
	position: absolute;
	top: 25px; right: 10px;	
	color: #fff;
	font: bold 15px "Trebuchet MS", Tahoma, Sans-serif;	
}
#header-content #header-links a {	
	color: #93C9F4;
	text-decoration: none;	
}
#header-content #header-links a:hover {
	color: #fff;		
}


/* Navigation */
#nav-wrap {
	float: left;
	width: 100%;
	background: url(images/menubg.jpg) repeat-x left bottom; 
	clear: both;
}
#nav {
	clear: both;	
	margin: 0 auto;
	padding: 0;		
}
#nav ul {
	float: left;
	list-style: none;
	text-transform: uppercase;
	margin: 0;
	padding: 0;	
	height: 64px;		
}
#nav ul li {
	float: left;
	margin: 0; padding: 0;
	height: 64px;
}
#nav ul li a {
	display: block;
	float: left;
	width: auto;
	margin: 0;
	padding: 0 15px;
	color: #FFF;
	font: bold 15px "Century Gothic", "Trebuchet MS", Helvetica, Arial, Geneva, sans-serif;
	text-decoration: none;	
	letter-spacing: 1px;	
}
#nav ul li a:hover, 
#nav ul li a:active {
	color: #333;	
}
#nav ul li#current {	
	background: url(images/nav-current.jpg) no-repeat center bottom;		
}
#nav ul li#current a {
	color: #333;
}

/* content */
#content-wrap {
	clear: both;
	float: left;
	background: #1183DA;		
	width: 100%;
}
#content {
	text-align: left;	
	padding: 0; 
	margin: 0 auto;		
}

/* sidebar */
#sidebar {
	float: right;
	width: 21em;
	margin: 10px 0 10px -21em; padding: 0;		
}
#sidebar h1 {
	font: bold 1.75em 'Trebuchet MS', Tahoma, Arial, Sans-serif;
	padding: .3em 0 .5em 10px; 
	color: #002368;	
}
#sidebar ul.sidemenu {
	list-style:none;
	margin: 0;
	padding: .3em 0 1em 5px;		
	font-family: 'Trebuchet MS', Tahoma, Sans-serif;		
}
#sidebar ul.sidemenu li {
	padding: 0; 
	background: url(images/sidebullet.gif) no-repeat .3em .5em;		
}

* html body #sidebar ul.sidemenu li { height: 1%; }

#sidebar ul.sidemenu li a {
	display: block;
	font-weight: bold;
	color: #E8F4FF;	
	text-decoration: none;
	padding: .2em 0 .2em 30px;
	line-height: 1.5em;
	font-size: 1.35em;
}
#sidebar ul.sidemenu li a:hover {
	background: #0F7ACC url(images/sidebullet.gif) no-repeat .25em .45em;	
	color: #FFF;			
}
#sidebar ul.sidemenu ul{
	margin-left: 15px;
}

#sidebar ul.sidemenu2 {
	list-style:none;
	margin: 0;
	padding: .3em 0 1em 5px;		
	font-family: 'Trebuchet MS', Tahoma, Sans-serif;		
}
#sidebar ul.sidemenu2 li {
	padding: .2em 0 .2em 30px;
	background: url(images/sidebullet.gif) no-repeat .3em .5em;		
}

* html body #sidebar ul.sidemenu2 li { height: 1%; }

#sidebar ul.sidemenu2 li a {
	display: block;
	color: #E8F4FF;	
	text-decoration: none;
	line-height: 1.5em;
}
#sidebar ul.sidemenu2 li a:hover {
	background: #0F7ACC  .25em .45em;	
	color: #FFF;			
}
#sidebar ul.sidemenu2 ul{
	margin-left: 15px;
}

#sidebar .sidebox {
	margin: 5px 15px 5px 0;
	padding: 0;
	background: url(images/sidebarsep.jpg) repeat-x left bottom;
}
#sidebar .sep{
	background: url(images/sidebarsep.jpg) repeat-x left bottom;
	height: 2px;
	margin: 0px 15px 10px 0;
	clear: both;
}

/* main */
#main {
	margin: 10px 23em 10px 0; 
	padding: 0;		
}
#main h1 { 
	font: bold 2.8em 'Trebuchet MS', Arial, Sans-serif;
	color: #B1E100;
	letter-spacing: -2px;		
	padding-bottom: 0;	
}
#main h1 a {
	color: #B1E100;
	text-decoration: none;
}

/* footer */
#footer-wrap {
	clear: both;
	border-top: 5px solid #86CC15;
	text-align: left;
	padding: 1.6em 0;	
}
#footer-wrap a {
	text-decoration: none;
	color: #5B9CFF;
	font-weight: bold;
}
#footer-wrap a:hover {
	color: #E8F4FF;	
}
#footer-wrap p {
	padding: 10px 0;
}
#footer-wrap h2 {
	color: #E8F4FF;
	margin: 0;
	padding: 0 10px; 
	text-transform: none;
}

/* footer columns */
#footer-columns {
	color: #5B9CFF;
	margin: 0 auto; 
	padding: 0;	
	width: 90%;	
}
#footer-columns ul {
	list-style: none;
	margin: 10px 0 0 0; 
	padding: 0;	
	background: url(images/footer-dots.jpg) repeat-x left top;	
}
#footer-columns li {
	background: url(images/footer-dots.jpg) repeat-x left bottom;		
}
#footer-columns li a {
	display: block;
	font-weight: normal;
	padding: .5em 0 .5em 1em;
	width: 96%;
}
#footer-columns .col3, .col3-center {
	float: left;
	width: 32%;
}
#footer-columns .col3-center { 
	margin: 0 15px; 
}

/* bottom */
#footer-bottom {
	clear: both;
	color: #E8F4FF;	
	margin: 0 auto; 
	padding: 1em 0;
	text-align: center;
}

/* alignment classes */
.float-left  { float: left; }
.float-right { float: right; }
.align-left  {	text-align: left; }
.align-right {	text-align: right; }

/* additional classes */
.clear { clear: both; }
.white {	color: #E8F4FF; }

img.rssfeed {
	border: none; 
	padding: 0 0 5px 0;
	background: transparent;
}

.post-by {
	font-size: .95em;	
	padding-top: 0;
}
.post-footer { 
	text-align: center; 
	background: #1E89DC;
	border: 1px solid #0065C6; 
	padding: 8px 10px;
	margin: 20px 15px 10px 15px;
}
.post-footer .date {
	background: url(images/clock.gif) no-repeat left center;
	padding-left: 20px; margin: 0 3px 0 3px;
}
.post-footer .comments {
	background: url(images/comment.gif) no-repeat left center;
	padding-left: 	20px; margin: 0 3px 0 3px;
}
.post-footer .readmore {
	background: url(images/page.gif) no-repeat left center;
	padding-left: 20px; margin: 0 3px 0 3px;
}

/* progress bar container */
#progressbar{
        border:1px solid black;
        width:70%;
        height:20px;
        position:relative;
        color:black; 
		background-color: white;
}
/* color bar */
#progressbar div.progress{
        position:absolute;
        width:0;
        height:100%;
        overflow:hidden;
        background-color:#369;
}
/* text on bar */
#progressbar div.progress .text{
        position:absolute;
        text-align:center;
        color:white;
}
/* text off bar */
#progressbar div.text{
        position:absolute;
        width:100%;
        height:100%;
        text-align:center;
}

:link img {
  border: none;
}

Code (markup):

Please tell me which one to edit, the site is in the sig, thanks!

 

/* sidebar */
#sidebar {
float: right;
width: 21em; // set width here eg 25em
margin: 10px 0 10px -21em; padding: 0; //change -21 to match above
}

/* main */
#main {
margin: 10px 23em 10px 0; //change 23 to new width above plus 2
padding: 0;
}

modify the code as shown above, keep the 2em gap between the sidebar and main content by changing the margin in #main id.
mark

 

Hello mark

Thanks for your suggestion, but i have changed according to your instruction but it seems does not make it wider in my screen. Maybe because it is fluid?

Thanks!