Need css for Tab titles

I want to change the font-size, font-weight and color of the Tab titles. The documentation mentions css as a parameter for [ac-tabs], but how do I find the selector for titles of the Tabs?

So far, I’ve got:

.myTab {
width: 90%;
vertical-align: bottom;
font-size: 14pt !important;
font-family: Helvetica, Arial, sans-serif;
font-weight: 600;
color: #00005c;
}`

[ac-tabs css=”myTab”]
[ac-tab title=”This one”] <!– want to modify these –>
text
[/ac-tab]
[ac-tab title=”That one”]
text
[/ac-tab]
[/ac-tabs]