/*Container buttons section header*/
.container_buttons_links_header {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap:wrap;
}

.container_buttons_links_header a:hover {
  color: #343a40;
}
/*color=dark*/
.container_buttons_links_header btn {
  width: 100px;
  height: 100px;
  background: #343a40;
  color: #fff;

  display: flex;
  justify-content:center;
  align-items:center;
}