Missing CSS class "widget" for widgets created within CUSTOM SIDEBARS

Hi,

there is something really essential missing in the plugin’s output:
The CSS class “widget” is missing, so that we can style the output of the widget areas and sidebars, that we had created with this plugin.

For better understanding:

This is the output without this plugin:

http://screencloud.net/v/gveg

This is the output with this plugin enabled and a custom sidebar with widgets created with it:

http://screencloud.net/v/ACRS

You see in the last screenshot, that we lost with this plugin the margins and paddings of all widgets, they are all close together.

Yes, I know, that we can style the CSS for these individual widget IDs. But what if they are changing from time to time?
Then we need to adapt these CSS styles for them again and again – annoying!

So could you please fix this or tell us a work-around, so that we can implement to all widget IDs

class="widget"

to the widgets created within the CUSTOM SIDEBARS?

Thanks.

(Using famous HUEMAN theme, WP 3.9.1 multisite, but plugin only active on one sub-blog)

https://ww.wp.xz.cn/plugins/custom-sidebars/