digitalmadness on "Line wont go away!"

On the left side of my sidebar thats also on the left is a black/gray line that I CANNOT get rid of no matter how much I try! Heres the CSS for my sidebar

#sidebar {
float:left;
background-color:white;
width:170px;
height:100%;
overflow:visible;
font-family:verdana;
font-size:10px;
font-weight:normal;
margin:0;
padding:10px 15px;
}

I've tried adding border-left:0px; but that didn't work either. Does anyone know what I can do to remove this line? Thank you!