body {
  background: ;
  }
  
.nav {
  background: url('https://neurotoxin.moe/r/g/bg/subnavigation_bar.png') no-repeat center;
  margin: auto;
  width: 100%;
  height: 80px;
  }
  
#main {
 
  padding: 0px;
  margin: auto;
  width: 95%;
  height: auto;
  border: 3px solid black;
  }
  
.rc {
  float: right;
  width: 25%;
  height: 100%
  background: blue;
  }

.mc {
  width: 50%;
  height: 100%;
   background: green;
  }
  
.lc {
  float: left;
  width: 25%;
  height: 100%;
  background: blue;
  }