@media only screen and (max-width: 1500px) { 

     .portfolio {
          width: 100.3%;
     }

     .portfolio li { 
          width:25%;
          margin:0 auto;	
     }

     #navigation ul li, #navigation2 ul li {
          display: inline;
          margin-right: 18px;
     }
     #logo img {
          height: 75px;
          margin-top: 2px;
     }
}