@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) {
  
  /************************
  HEADER
  ************************/
  
    nav {
        background: none;
        float: right;
        font-size: 1.125em;
        margin-right: 5%
          text-align: right;
        width: 45%;   
        }
    
    #logo {
    float: center;
     /* margin-left: 45%; */
        text-align: center;
     /* width: 45%; */
    }
    
    h1 {
      font-size: 2.5em;
    }

    h2 {
      font-size: 0.825em;
      margin-bottom: 20px;
    }
    
    header {
      border-bottom: 5px solid #007ACC;
      margin-bottom: 60px;
    }

  
}