Widget css

some themes add an individual css id (individual to each widget) and a css class (specific to a widget type) to the widget code;

this is done by the way ‘register_sidebar()’ is used in functions.php of the theme: http://codex.wordpress.org/Function_Reference/register_sidebar
'before_widget' => '<li id="%1$s" class="widget %2$s">',
(your theme might be different)

this would give you the specific css class to target the category widget.

if you need more detailed help, please post a link to your site.

open functions.php of your theme and search for register_sidebar(

in that section, there might be a line:

'before_widget' => '<div class="widget">',

try and change that to:

'before_widget' => '<div class="widget %2$s">',

the changes should output a widget specific css class, which you should be able to use in your css;
probably, example:

.widget_categories .widget-content { padding-top:60px; padding-left:10px; }

(instead of your .widget-content2 { padding-top:60px; padding-left:10px; } )

That looks a little complicated,

you are possibly right.

you might need to ask the theme’s vendor for support –

helping with a commercial theme is virtually impossible as there is no free access to the theme templates.