.separate-containers

Hi,

after a long search and html inspection, I found a custom CSS section that needs to be customized for my purposes as following:

from

.separate-containers .inside-article,
.separate-containers .widget,
.separate-containers .comments-area,
.separate-containers .page-header,
.separate-containers .paging-navigation {
	padding: 40px;
}

to

.separate-containers .inside-article,
.separate-containers .widget,
.separate-containers .comments-area,
.separate-containers .page-header,
.separate-containers .paging-navigation {
    padding-right: 0px;
    padding-left: 0px;
    padding-top: 30px; 
    padding-bottom: 30px;
}

My question: is there an according section in the the theme settings so that I can do this by mouse?

Thanks in advance