i have a string var with html content,check the following

`var dc = "<html><head><style type='text/css' >.round {border:2px solid grey;width:auto;}</style></head> <body></body>";`

Now how can i change the content inside the `.round` scopes.I mean `border:2px solid grey;width:auto;` ??

can i use `replaceWith` or any other techniques ??

Please reply ,Thank you.