Getting rid of the original header border

When you put your own banner in your header of your blog, depending on the template you are using, the original header borders still show up behind your banner. Most people don't remove them and so their blog header to me, looks weird. So to correct that, here's how atleast on the Minima template I am using. Go to your template html, always back it up before changing. Look for this code:

#header-wrapper {
width:800px;
margin:0 auto 10px;
border:0px solid $bordercolor; }

#header-inner {
background-position: center;
margin-left: auto;
margin-right: auto;}

#header {
margin: 1px;
border: 0px dotted $bordercolor;
text-align: center;
color:$pagetitlecolor;

I have already changed mine to 0px, yours will probably have a 1px, just change it to 0px.