Correcting Left Margin Using CSS?

My galleries are both collage portrait & landscape. I've used CSS to round the corners, and then had to add CSS to modify the right margin in order to eliminate the squared corners that erroneously appeared there.
My left margin is now a lot narrow than the right. Does anyone know what is the correct CSS to offset the right margin the same amount of pixels?
.sm-tiles-row-organic .sm-tiles-list { overflow: visible; margin: 0 0 0 -18px; }
My left margin is now a lot narrow than the right. Does anyone know what is the correct CSS to offset the right margin the same amount of pixels?
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