.toolbar .toolbar-icon.toolbar-icon-hcp-base-index {
  position: relative;
  padding-left: 3.75em;
}

/*
  Visit site https://flagicons.lipis.dev/ and choose flag that you need.
*/
.toolbar .toolbar-icon.toolbar-icon-hcp-base-index:before {
  left: 0;
  top: 0;
  width: 45px;
  background-image: url("../img/eu.svg");
}