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This document lists the panels available in Theme Builder 2.0 and their CSS classes and HTML IDs...

Builder themed pages are organised in to several panels as illustrated below:

Theme Builder Plugin > Panel Classes and IDs > builder.config.allpanels.detail.png

Each panel has a class and most have an ID allowing very precise control over style sheet settings:

Wherever possible, avoid using the ID in your style sheet as these may change in later versions of Builder.

FAQs

Try making them more specific, eg:
.atb-body .atb-content h1 {
 color: red;
}