How to Make a Website: CSS for contact-info class not being applied when I open in browser

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

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

a {
  text-decoration: none;
}

img{
  max-width: 100%
}

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

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

h1 {
  font-family: 'Changa One', sans-serif;
  margin: 15px 0;
  font-size: 1.75em; 
}

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:800;
  padding: 15px 10px;
}

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

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



/****************************************
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: #bdc3c7;
}



/****************************************
PAGE: ABOUT
****************************************/

  .profile-photo{
  display: block;
  max-width: 150px;
  margin: 0 auto 30px;
  border-radius: 100%;
  padding-top: 10px;
}


/****************************************
PAGE: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;
}