OliveTin/integration-tests/tests/cssClass/custom-webui/themes/cssclass-theme/theme.css

/* Theme for cssClass integration test: set a distinct background on the action button */
.action-button button.test-custom-class {
  background-color: rgb(32, 64, 128);
}

/* Display cssClass must be overridable by theme rules (#804) */
.display.test-display-class {
  background-color: rgb(64, 128, 192);
}