My header has disappeared after following the code.

/**********************************
              Basic
***********************************/

body {
  font-family:'Open Sans', sans-serif;
}
#wrap {
 max-width:940px;
 margin: 0 auto;
  padding:0 5%;
}

/*links*/
a {
  text-decoration:none;
  color: #2dabab;   
}


/**********************************
              Head
***********************************/

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

h1 {
  font-family:'Changa One', 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

/**********************************
              Footer
***********************************/
footer {
      font-size:0.75em;
      text-align:center;
      padding-top:50px;
      color: #ccc


/**********************************
              Colors
***********************************/

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

/* Blue header */
header {
  background: #39d6d6;
  border-color: #2dabab
}

/* Nav background on mobile */
nav {
  background:#2dabab;
}

/* Logo Text */
h1, h2 {
  color: #fff;
}

nav a, nav a:visited {
  color:#FFF;
}

/* Selected nav link */
nav a.selected, nav a:hover {
  color:#1c6b6b;
}