The buttons are (unfortunately) defined in the CoL theme
shortcode:
[button type="type" size="size" url="address" text="button label"]
primary, large
CNN
[button type="primary" size="large" url="http://cnn.com" text="CNN"]
default, large
NYTimes
[button type="default" size="large" url="http://nytimes.com" text="NYTimes"]
info, large
AJC
[button type="info" size="large" url="http://ajc.com" text="AJC"]
success, large
CNN
[button type="success" size="large" url="http://cnn.com" text="CNN"]
danger, default
WSJ
[button type="danger" size="default" url="http://wsj.com" text="WSJ"]
primary, small
WSJ
[button type="primary" size="small" url="http://wsj.com" text="WSJ"]
NOTE: for this page to operate correctly, the second shortcodes must have the square brackets entered as HTML codes /" dummy="#91; and /" dummy="#93;
Do not edit in the "Visual" WYSIWYG editor, as it converts them to [ ] brackets!