CSS = Cascading Style Sheet

• CSS-Selector — are used to "find" (or select) HTML elements based on their element name tag, id #, class ., attribute, and more.
• styling-rules — are inside the curly brackets {}
• style property — for example width, color or font-size
• property-value — for example 100px, red or 14px. Value is surrounded by quotations marks "".

/* seperated by comma 
 * can be classes, id's or tags, doesnt really matter */ 
h1, h2, p, 
.banners, .container,
#top-logo, #footer-logo {
  property: value;
  property: value;
  property: value;
}