:host {
  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  box-sizing: border-box;
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  -ms-box-sizing: border-box;
  display: block;
}

iron-icon {
  display: block;
  background: #444;
  color: #ddd;
  border-radius: 2px;
  margin: 1px;
  border: 1px solid rgba(255, 255, 255, 0.25);
  cursor: pointer;
  width: 22px !important;
  height: 22px !important;
}

:host(:hover) iron-icon,
:host(.iron-selected) iron-icon {
  border: 1px solid rgba(255, 255, 255, 0.5);
  background: #999;
  color: white;
}