问为什么Codemirror编辑器不水平滚动长行？

EN

    .CodeMirror {
  /* Set height, width, borders, and global font properties here */
  font-family: monospace;
  height: 750px;
  color: black;
  direction: ltr;

}


.CodeMirror-scroll {
  overflow: scroll !important; /* Things will break if this is overridden */
  /* 50px is the magic margin used to hide the element's real scrollbars */
  /* See overflow: hidden in .CodeMirror */
  margin-bottom: -50px; margin-right: -50px;
  padding-bottom: 50px;
  height: 100%;
  outline: none; /* Prevent dragging from highlighting the element */
  position: relative;
  z-index: 0;
}

window.editor= function (dontNetObjRef) {

    editor = CodeMirror.fromTextArea(document.getElementById('myTextArea'), {
        lineNumbers: true,
        indentUnit: 4,
        lineWrapping: true,
        tabMode: "shift",
        gutters: ["CodeMirror-lint-markers"]
    });

    //JavaScript function use the onchange event of CodeMirror to invoke the C# method and pass the value of the myTextArea .

    editor.on("change", editor => {
        dontNetObjRef.invokeMethodAsync("UpdateField", editor.getValue());
        // console.log(editor.getValue());

    });