Oh just tried again in Edit CSS instead of editing style.css in the Editor and it worked, thank you @codemaniac !
in /**10.0 – Widgets/ I changed the original
border-top: 4px solid #1a1a1a;
to
.widget {
border-top: none;
margin-bottom: 3.5em;
padding-top: 1.75em;
}
but I am still seeing these horizontal bars
