performance-art.fr/sites/all/modules/contrib/dev/ctools/css/dropbutton.css

.ctools-dropbutton-processed {
  padding-right: 18px;
  position: relative;
  background-color: inherit;
}

.ctools-dropbutton-processed.open {
  z-index: 200;
}

.ctools-dropbutton-processed .ctools-content li,
.ctools-dropbutton-processed .ctools-content a {
  display: block;
}

.ctools-dropbutton-processed .ctools-link {
  bottom: 0;
  display: block;
  height: auto;
  position: absolute;
  right: 0;
  top: 0;
  width: 17px;
}

.ctools-dropbutton-processed .ctools-link a {
  overflow: hidden;
}

.ctools-dropbutton-processed .ctools-content ul {
  margin: 0;
  overflow: hidden;
}

.ctools-dropbutton-processed.open li + li {
  padding-top: 4px;
}

/**
 * This creates the dropbutton arrow and inherits the link color
 */
.ctools-twisty {
  border-bottom-color: transparent;
  border-left-color: transparent;
  border-right-color: transparent;
  border-style: solid;
  border-width: 4px 4px 0;
  line-height: 0;
  right: 6px;
  position: absolute;
  top: 0.75em;
  white-space: nowrap;
}

.ctools-dropbutton-processed.open .ctools-twisty {
  border-bottom: 4px solid;
  border-left-color: transparent;
  border-right-color: transparent;
  border-top-color: transparent;
  top: 0.5em;
}

.ctools-no-js .ctools-twisty {
  display: none;
}