Add modifier class to fix button margin

src/components/modal/base/modal.scss

@@ -84,6 +84,12 @@ row to appear to contain overflow. */
     margin-bottom: .9375rem;
 }
 
+/* For action button row where left/right margin is handled by parent element */
+.action-buttons.action-buttons-no-inset {
+    margin-left: 0;
+    margin-right: 0;
+}
+
 .action-button {
     margin: 0 0 0 .54625rem;
     border-radius: .25rem;

src/components/modal/report/form-step.jsx

@@ -45,7 +45,7 @@ class FormStep extends React.Component {
                 onValidSubmit={onNext}
             >
                 {children}
-                <FlexRow className="action-buttons">
+                <FlexRow className={classNames('action-buttons', 'action-buttons-no-inset')}>
                     <Button
                         className={classNames(
                             'action-button',