Remove Black Bars from Videos

yscale_key.js

javascript: (function() {
  window.Yscale = {};

  const $ = document.querySelector.bind(document);
  var r = $(":root");
  Yscale.change = (val) => {
    val = val.toString().padStart(2, "0");
    r.style.setProperty("--sy", `1.${val}`);
  };

  Yscale.init = () => {
    let val = 33;
    if (localStorage.vval)
      val = parseInt(localStorage.vval);
    let video = $("video");
    if (location.host.includes("primevideo"))
      video = $(".rendererContainer");
    let pre = "";
    if (location.host.includes("netflix"))
      pre = "translate(-50%, -50%)";
    video.style.transform = pre + "scaleY(var(--sy))";
    video.style.height = `99%`;
    Yscale.change(val);
    document.addEventListener("keydown", ({
      key,
    }) => {
      if (event.isComposing || event.keyCode === 229) {
        return;
      }
      if (key == "[") {
        val += 1;
        Yscale.change(val);
      }
      if (key == "]") {
        val -= 1;
        Yscale.change(val);
      }
      localStorage.vval = val;
    });
  };

  Yscale.init();
})();