How to Remove Margin from Sidebar Form

Looks like it is centered. Do you mean you want it left-aligned like the rest of the sidebar?

Yes, sorry, left-aligned is what I meant.

Copy/paste this as-is at the very end of the style block in your text widget, just before the </style> tag (make a copy of everything in the widget first so you can revert if necessary ?? ).

#af-form-1171967499, #af-form-1171967499 .quirksMode {
width:100%;
}

#af-form-1171967499 .af-header {
  padding:1px 15px 1px 0;
}

#af-form-1171967499 .af-standards .af-element {
padding-left:0;
}

#af-form-1171967499 .buttonContainer {
text-align: left;
}

Wow, thank you very much Michelle. You are very helpful!!