Пожалуйста обновите ваш браузер

_bu.css

.buorg {
  background-color: rgba(0,0,0,1)!important;
  color: white!important;
  border-bottom: 1px solid white!important;
}
.buorg #buorgul {
  background: #3266CC;
}

_bu.js

// https://browser-update.org/
var $buoop = {
  required: { e: -4, f: -3, o: -3, s: -1, c: -3 },
  insecure: true,
  unsupported: true,
  api: 2019.10,
  reminder: 0,
  reminderClosed: 0,
  noclose: false,
  no_permanent_hide: true,
  test: false
};
function $buo_f() {
  var e = document.createElement("script");
  e.src = "//browser-update.org/update.min.js";
  document.body.appendChild(e);
};
try { document.addEventListener("DOMContentLoaded", $buo_f, false) }
catch (e) { window.attachEvent("onload", $buo_f) }

index.html

<script src="./js/_bu.js" defer>/* browser update */</script>