How can I do

a {
  text-decoration: none;
}

#wrapper {
  max-width: 940px;
  margin: 0 auto;
}

#logo {
  text-align: center;
  margin: 0;
}

h1, h2 {
  color: #fff;
}

nav a {
  color: #fff;
}

nav a:hover {
  color: #32673f;
}

h1 {
  font-family: ‘Changa One’, sans-serif;
  font-size: 1.75em;
  font-weight: normal;
}

img {
  max-width: 100%;
}

#gallery {
  margin: 0;
  padding: 0;
  list-style: none;
}

#gallery li {
  float: left;
  width: 45%;
  margin: 2.5%;
  background-color: #f5f5f5;
  color: #bdc3c7;
}

nav ul {
  list-style: none;
  margin: 0 10px;
  padding: 0;
}

nav li {
  display: inline-block;
}

nav a {
  font-weight: 800;
  padding: 15px 10px;
}

.profile-photo {
  display: block;
  margin: 0 auto 30px;
      max-width: 150px;
  border-radius: 100%;
}

.contact-info {
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 0.9em;
}

.contact-info a {
  display: block;
  min-height: 20px;
  background-repeat: no-repeat;
  background-size: 20px 20px;
  padding: 0 0 0 30px;
  margin: 0 0 10px;
}

@media screen and (min-width: 480px) {

    /********************************
    TWO COLUMN LAYOUT
    ********************************/

    #primary    {
        width: 50%;
        float: left;
    }   

    #seondary   {
        width: 40%;
        float: right;
    }



    /*********************************
    PAGE: PORTFOLIO
  85%/3=28.3333%
    *********************************/

    #gallary li{
        width: 28.3333%
    }

    #gallary 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: right;
    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 #599a68;
        margin-bottom: 60px;
    }
    }
}