@media screen and (min-width: 480px){
  /****************************
  TWO COLUMN LAYOUT
  *****************************/
  #primary {
    width: 50%;
    float: left;
  }
  #secondary {
    width: 40%;
    float: right;
  }
  
  #gallery li{
    width: 28.3333%; 
  }
  #gallery li:nth-child(4n){
    clear:left;
  }
  /****************************
  ABOUT
  *****************************/
  .profile-photo {
    float: left;
    margin: 0 5% 80px 0;
  }
   /****************************
  TUTORIALS
  *****************************/
   .underconstruction {
    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: 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: 5 px solid #599a68;
    margin-bottom: 60px;
  }
 
}