my header border is not the same as Nick in the video for some reason my bottom border is not right

/************************************
  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%;
}

/*****************************
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:'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;
}

/**************************
Nav
***************************/

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

}

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

nav li{
display:inline-block;  
    }

/*****************************
Footer
*****************************/
footer{
 font-size:0.75em;
 text-align:center;
 clear:both;
 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;

}


/*****************************
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;

}

/***Link***/
a {
  color:#6ab47b;

}



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

}

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













/************************************
  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%;
}

/*****************************
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:'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;
}

/**************************
Nav
***************************/

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

}

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

nav li{
display:inline-block;  
    }

/*****************************
Footer
*****************************/
footer{
 font-size:0.75em;
 text-align:center;
 clear:both;
 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;

}


/*****************************
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;

}

/***Link***/
a {
  color:#6ab47b;

}



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

}

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