Hi Gabrielle
1.a. To amend you can add the following to the Custom CSS field of your templates parameters (Extensions -> Templates -> [YourTemplateStyle] -> Custom CSS)....
.module .module_header h3 {
text-align: center;
}
1.b. To the same CSS field also add the following...
.contentbottom .custom {
padding: 0 40px;
}
2. I am not sure if I understand you correctly. Would you have an image detailing what you wish to achieve?
Ciarán