typo.css in plugin folder

Hi.
I crated a website on eximium template, and prepare "menu" using a catted img in table
there was a problem with making a whole picture in table due to this css rule
img {
max-width: 100%;
vertical-align: middle;
border: 0;
height: auto;
}
located: localhost/website/plugins/system/yjsg/assets/css/typo.css
so i just simply delated it ( height: auto - any other values (i tried to override in custom.css) didn't work - only delating
I am pretty sure that after next plugin update it will appear again
Is there any chance to fix this problem?

Are you sure your are posting in product assigned forum?: Yes

What is your CMS version?: Joomla 3.x

MySQL Version: 5.x

PHP version: N/A

Link to installation: localhost

Have you edited any files? If yes tell us which ones.: Yes

Is this personal or client website?: Personal