Margins not changing

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

body {
  font-family: 'open sans', 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: 'Special Elite', 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: 800;
  padding: 14px 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 5%;
}


/* ************************************
PAGE PORFIOLIO
***************************************/ 

#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%;
}

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

.contact-info{
  list-style:none;
  margin: 0;
  padding: 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 0 20px;
}
.contact-info li.phone a {
  background-image: url('../img/phone.png');
}

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



/* ************************************
COLOURS
***************************************/ 

/* site body*/ 
body {
  background-color: #fff;
  color: #999;
}
/* green header*/ 
header {
  background: #6ab47b;
  border-color: #599a68;
}

/* nav background on mobile devices*/ 
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;
}