From your dashboard, you’ll want to navigate to Appearance > Editor.
Then, look for the area below:
.site-container { background: #fff url('images/hdot.png') repeat-x; border: 10px solid #fff; border-top-left-radius: 20px; border-top-right-radius: 20px; margin: 20px auto; max-width: 1168px; }<br>
And replace that top line so that it looks like this:
.site-container { background: #fff; border: 10px solid #fff; border-top-left-radius: 20px; border-top-right-radius: 20px; margin: 20px auto; max-width: 1168px; }<br>