default background color issue

/* CSS Document */

html, body, table, th, tr, td, p, img, hr, ul, li, h1, h2, h3, h4, h5, div, form, fieldset {padding:0; margin:0; border:none;  }

/* Eric Meyer's Reset CSS v2.0 - http://cssreset.com */
html,body,div,span,applet,object,iframe,h1,h2,h3,h4,h5,h6,p,blockquote,pre,a,abbr,acronym,address,big,cite,code,del,dfn,em,
img,ins,kbd,q,s,samp,small,strike,strong,sub,sup,tt,var,b,u,i,center,dl,dt,dd,ol,ul,li,fieldset,form,label,legend,table,caption,
tbody,tfoot,thead,tr,th,td,article,aside,canvas,details,embed,figure,figcaption,footer,header,hgroup,menu,nav,output,ruby,section,
summary,time,mark,audio,video{border:0;font-size:100%;font:inherit;vertical-align:baseline;margin:0;padding:0}article,aside,details,
figcaption,figure,footer,header,hgroup,menu,nav,section{display:block}body{line-height:1}ol,ul{list-style:none}
blockquote,q{quotes:none}blockquote:before,blockquote:after,q:before,q:after{content:none}
table{border-collapse:collapse;border-spacing:0}

body {background-color:#0000ff;
      font: Arial, Helvetica, sans-serif; size:20px; color:#ffffff; line-height: 1.5;
	  }	  

A:link{text-decoration: none; color:#0bbcf6;}
A:visited {text-decoration: none; color:#00e741;}
A:active {text-decoration: none; color:#00e741;}
A:hover {text-decoration: underline; color: red;}	  

#main {
   background:#000000;
   width:1000px;
   height:1200px;
   margin:auto;
   border:solid 1px #0000FF;
   }

#header {
   width:1000px;
   height:30px;
   border-bottom:solid 1px #0000FF;
   margin:auto;
 }

#container {
   width:780px;
   height:750px;
   margin-top:100px;
   float:right;
   border-top:solid 1px #0000FF;
   border-left:solid 1px #0000FF;
   border-bottom:solid 1px #0000FF;
   font-family:hobo std;
   letter-spacing:1px;
   padding:10px 0 0 10px;

   }  

#sidebar {
   border-right:solid 1px #0000FF;
   border-top:solid 1px #0000FF;
   border-bottom:solid 1px #0000FF;
   margin-top:100px;
   width:180px;
   height:750px;
   float:left;
   color:#ffffff;

   }

#footer {
   width:1000px;
   height:200px;
   border-top:solid 1px #0000FF;
   margin-top:970px;
   background-color:#222226;
   }
nav {
   margin:0px 50px ;

}
nav ul li {
      display:inline-block;
	  *display: inline;
    zoom: 1;
      font-family:hobo std;
	  margin:7px 5px 5px 5px;

}
nav ul li a {
      padding:20px 30px;
	  color:#0000ff;
	  text-decoration:none;
}

.widget {
  border-bottom:solid 1px #0000FF;
  clear:both;
  padding:10px 8px 10px 10px;
  font-family:hobo std;
  color:#87d6f7;
  letter-spacing:0.5px;

  }

ul li {list-style-type:none;}

#commentdiv { margin-top:200px;}

i watn to change the background color of body. the blue color

why i must remove it ?

i remove it and after refresh it turn back to blue

no . i wat to chand the background of the body.not the main <div>
i want to change it from the wordpress , not from the css

i said i want to id=”main” color to be black. i want to change the color of the body tag . the blue color . from the wordpress dashbord , not from css