var coverSupport =
        "CSS" in window &&
        typeof CSS.supports === "function" &&
        (CSS.supports("top: env(a)") || CSS.supports("top: constant(a)"));
      // document.write(
      //   '<meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0' +
      //   (coverSupport ? ', viewport-fit=cover' : '') + '" />')
      var meta = document.createElement("meta");
      meta.content =
        "width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0" +
        (coverSupport ? ", viewport-fit=cover" : "");
      meta.name = "viewport";
      document.getElementsByTagName("head")[0].appendChild(meta);