respond.css

 /**********
  TWO COLUMN LAYOUT
  **********/
 
  @media screen and (min-width: 480px) {
  #primary {
    width: 50%;
    float: left;
  }
  
  #secondary {
    width: 40%;
    float: right;
  } 
}

@media screen and (min-width: 660px) { 
  } 
}


/**********
PAGE: PORTFOLIO
**********/

#gallery li {
  width: 28.3333%;
  }

#gallery li:nth-child(4n) {
  clear: left;
}

 /**********
  HEADER
  **********/
  
  
  nav {
    background: none;
    float: right;
    font-size: 1.125em;
    margin-right: 5%;
    text-align: right;
    width: 45%
  }
  
  #logo {
    float: left;
    margin-left: 5%;
    text-align: left;
    width: 45%;
  }
  
  h1 {
    font-size: 2.5em;
  }
  
  h2 {
    font-size: 0.825em;
    margin-bottom: 20px;
  }
  
  header {
    border-bottom: 5px solid #599868
    margin-bottom: 50px;
  }
}