@media screen and (min-width: 480px){
 
  /*********************************
  two column layout
  *********************************/
  
  #primary{
    width: 50%;
    float:left;
  }
  
  #secondary{
    width: 40%;
    float:right;
  }
  
  /*********************************
  page: portfolio
  *********************************/
  
  #gallery li{
    width: 28.3333%
  }
  #gallery li:nth-child(4n){
  clear: left;
  }
  
  /*********************************
  page: about
  *********************************/
  
  .profile-photo{
    float:left;
    margin: 0 5% 80px 0;
  }
  
  
  
}
@media screen and (min-width: 660px){
 
  /*********************************
  page: header
  *********************************/
  
  nav {
    background: none;
    float:right;
    font-size:1.125em;
    margin-right: 5%;
    text-align: right;
    width: 45%;
  }
 #logo {
    
    float: left;
    margin-right: 5%;
    text-align: left;
    width: 45%;
  }
  h1{
    font-size:2.5em 
  }
  h2{
    font-size: 0.825em;
    margin-bottom: 20px;
  }
  header{
    border-bottom: 5px solid #599a68;
    margin-bottom: 60px;
  }
}