/* Neutralize Bootstrap .row negative margins inside powermail fieldsets.
   powermail 13.x wraps fields in <div class="row"> via createRowTags (numberOfColumns=2 default),
   which triggers Bootstrap 4's margin-left/right: -15px and causes the form to overflow
   its container. numberOfColumns is set to 0 via TypoScript, but this rule is a safety net. */
.tx-powermail .powermail_fieldset .row {
    margin-left: 0;
    margin-right: 0;
}