No space between the navigation bar and Profile pic on About page, and the top line of Contact page.

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

<!--CSS rule contains selector and declarations-->
<!--CSS selector defines elements on page to which declarations should be applied -->
<!--CSS declaration pairs properties and values to define how an element should be styled-->
body <!--selector--> { <!--Text inside curly brackets = declaration-->
  font-family:<!--property--> 'Open Sans', sans-serif; <!--value--> <!--Defines which fonts should be applied to text-->
}

#wrapper {
  max-width: 940px;
  margin: 0 auto; <!--Sets the space around the exterior sides of an element-->
  padding: 0 5%; <!--Sets the space on the interior four sides of an element-->
}

a {
  text-decoration: none; <!--Add or remove underlines from text-->
}

img {
  max-width: 100%; <!--Sets max width of an element-->
}




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

header{
  float: left; <!--Allows an element to be taken out of the normal flow and placed to the left or right of its container-->
  margin: 0 0 30px 0;
  padding: 5px 0 0 0;
  width: 100%;
}

#logo {
  text-align: center; <!--Sets justification of text-->
  margin: 0;
}

h1 {
  font-family: 'Changa One', sans-serif;
  margin: 15px 0;
  font-size: 1.75em;
  font-weight: normal; <!--Sets the visual weight of text, also known as "bold"-->
  line-height: 0.8em;, <!--Sets the amount of space between each line of text-->
}

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

h3 {
  margin: 0 0 1em 0;
}


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

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

nav ul {
  list-style: none; <!--Sets the sytle of numbers or bullet points for ordered and unordered lists-->
  margin: 0 10px;
  padding: 0;
}

nav li {
  display: inline-block; <!--Sets how an element should be rendered--> 
  <!--Block-level elements occupy the width of their containers and include a line break (eg. <div>, <h1>, <p>)--> 
  <!--Inline elements occupy the width of their containers and do not begin a new line (eg. <a>, <img>)-->
}

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




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

footer {
  font-size: 0.75em;
  text-align: center;
  clear: both; <!--Specifies whether an element can be adjacent to floated elements moved down and "clear" of any floated elements-->
  padding-top: 50px;
  color: #ccc; <!--Sets text color of an element-->
}

.social-icon {
  width: 40px;
  height: 40px;
  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; <!--Sets the background color of an element-->
  color: #bdc3c7;
}

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



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

.profile-photo {
  display: block;
  max-width: 500px;
  margin: 20px auto 30px auto;
  border-radius: 100%; <!--Defines the roundness of a border corner-->
}



/********************
COLORS
*********************/

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

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

/* logo text */
h1, h2 {
  color: #fff;
}

/* nav background on mobile */
nav {
  background: #599a68;
}

/* links */
a {
  color: #6ab47b;
}

/* nav link */
nav a, nav a:visited {
  color: #fff;
}

/* selected nav link */
nav a.selected, nav a:hover {
  color: #32673f;
}