Please help!!! Can someone look at this and tel me what i did wrong?

/***************************
GENERAL
****************************/

#wrapper {
max-width: 940px;
margin: 0 auto;
padding: 0 5%;
}

a {
  text-decoration: none;
}




/***************************
HEADING
****************************/

#logo {
  text-align: center;
  margin: 0;
}
h1 { font-family: 'Changa One', sans-serif;

margin: 15px 0;
font-size: 1.75em;
}



/***************************
COLORS
****************************/

/*site body*/
body {
  background-color: #fff;
  color: #999;
}

/* green header*/
header {
background: #6bb47b;
border-color: #499a68;
}

/* nav background on mobile*/
nav {
background: #599a68;
}
/* logo text*/
h1, h2 {
  color: #fff;
}

/* links */
a {
  color: #6ab47b;
}

/* nav link*/
nav a, nav a:visited {
color: #fff;
}

/* selected nav link */
nav a.selected, nav a:hover {
color: #32673f;
}