semi-design/packages/semi-foundation/checkbox/fallback.scss

@supports not (color: revert) {
    .#{$module}-content{
        margin-left: $spacing-checkbox_label-paddingLeft;

        .#{$module}-extra{
            margin-top: $spacing-checkbox_extra-marginTop;
        }
    }

    .#{$module}Group-horizontal{
        .#{$module}{
            margin-right: $spacing-checkbox_group_horizontal-marginRight;
        }
    }

    .#{$module}Group-vertical{
        &>.#{$module}{
            margin-bottom: $spacing-checkbox_group_vertical_item-marginBottom;
        }
    }
}