.jimu-widget-extent-navigate {
  background-color: transparent;
}

.jimu-widget-extent-navigate .operation {
  color: white;
  background: rgba(0,0,0,0.5);
  border-radius: 0;
  -webkit-border-radius: 0;
  -moz-border-radius: 0;
  margin-bottom: 5px;
}
.jimu-widget-extent-navigate .operation.jimu-state-disabled:hover{
  background: rgba(0,0,0,0.5);
}