When creating my about page my profile-photo is stuck to the very bottom of the navigation, there is no gap/margin?

a{
    text-decoration: none;
}

a{
    color: #fff;
}

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

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

header{
    background: #1F3324;
    border-color: #3D6647;
}

h1, h2{
    color: #fff;
}

nav{
    background: #3D6647;
}

nav a, nav a:visited: #fff;

nav a.selected, nav a:hover{
    color: #99FFB2;
}

body{
    background-color: #fff;
    color: #5C996B;
}

h1{
    font-family: '', sans-serif;
    font-size: 2em;
    font-weight: normal;
    line-height: 0.8em;
    margin: 15px 0;
}

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

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

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

footer{
    text-align: center;
    padding-top: 50px;
    font-size: 0.75em;
    color: #99FFB2;
    clear: both;
}

img{
    max-width: 100%;
}

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

#gallery li{
    float: left;
    width:45%;
    margin: 2.5%;
    background-color: #3D6647;
    color: #5C996B;
}



#gallery li a p{
    font-size: 0.75em;
    margin: 0;
    padding: 5%;
    color: #5C996B;
}

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


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

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

nav li{ 
    display: inline-block;
}

nav a{
    font-weight: 800;
    padding:15px 10px;
}

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