materio-base-d7/sites/all/modules/contrib/fields/hierarchical_select/includes/common_config_form.css

.hierarchical-select-config-form .live-preview {
  margin-left: auto;
  margin-right: auto;
  width: 25em;
  float: right;
}

.hierarchical-select-config-form fieldset {
  clear: right;
}