@salesforce-ux/design-system/css/summary-detail/base/index.css

Salesforce Lightning Design System

/*! Lightning Design System 2.12.0 */
@charset "UTF-8";
.slds-summary-detail {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: start;
  -ms-flex-align: start;
  align-items: flex-start;
}
.slds-summary-detail .slds-summary-detail__action-icon {
  -webkit-transform: rotate(-90deg);
  transform: rotate(-90deg);
}
.slds-summary-detail .slds-summary-detail__content {
  overflow: hidden;
  visibility: hidden;
  opacity: 0;
  height: 0;
}
.slds-summary-detail.slds-is-open .slds-summary-detail__action-icon {
  -webkit-transform: rotate(0deg);
  transform: rotate(0deg);
  -webkit-transform-origin: 45%;
  transform-origin: 45%;
}
.slds-summary-detail.slds-is-open .slds-summary-detail__content {
  padding-top: 0.75rem;
  overflow: visible;
  visibility: visible;
  opacity: 1;
  height: auto;
}