The icons on the Contact page are not appearing on the site.

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

body {
  font-family: 'Source Sans Pro', sans-serif;
   } 

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

a {
text-decoration: none;
}

img {
  max-width: 100%;
}

h3 {
  margin: 0 0 1em 0;
  }

/**********************************
HEADING
**********************************/
header {
  float: left;
  margin: 0 0 30px 0;
  padding: 5px 0 0 0;
  width: 100%
   } 

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


h1 {
font-family: 'Raleway', 'sans-serif';
  margin: 15px 0;
  font-size: 1.75em;
  font-weight: normal;
  line-height: 0.8em;
   } 

h2 {
  font-size: 0.75em;
  margin: -5px 0 0;
  font-weight: normal;
  } 

/**********************************
NAVIGATION
**********************************/

nav {
  text-align: center;
  padding: 10px 0;
  margin: 20px 0 0;
  } 

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

nav li {
display : inline-block;
 } 

nav a {
 font-weight: 900;
  padding: 15px 10px;
  }



/**********************************
FOOTER
**********************************/

footer  {
  font-size: 0.75em;
  text-align: center;
  clear: both;
  padding-top: 50px;
  color: #ccc;
  } 

.social-icon {
  width: 20px;
  height: 20px;
  margin: 0 5px;
 } 



/**********************************
PAGE: PORTFOLIO
**********************************/

#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: #bbc3c7;
  }


/**********************************
ABOUT
**********************************/

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


/**********************************
CONTACT
**********************************/

.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;
   }

.contact-info li phone a {
  background-image: url('../img/phone.png');
     }

.contact-info li mail a {
  background-image: url('../img/mail.png');
 }

  .contact-info li twitter a {
  background-image: url('../img/twitter.png');
     }

/**********************************
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;
 } 

* section */
section: {
color: #999;
   }