boxout.css in Boxout 8

/* CSS for admin interface only */
#editor-boxout-dialog-form .form-item-attributes-header {
  float: left;
  padding-right: 10px;
}

#editor-boxout-dialog-form .form-item-attributes-header-element-type {
  float: left;
}

#editor-boxout-dialog-form .form-item-attributes-body {
  clear: both;
}