Why is My CSS code highlighted red? After Page: portfolio, #gallery, #gallery li #gallery li ap, etc are all red

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

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

#gallery li a p {
  margin: 0;
  padding: 5%;
  font-size: 0.75em;
  color: #bdc3c7;
}

/*******************************
Colors
********************************/

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

/*green header*/
header {
  background: #6ab47b;
  border-color: #599a68;
}

/*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; 
}