ของลับ

document.getElementsByClassName("lines-content monaco-editor-background")[0].style.backgroundImage="url(https://i.vgy.me/GkZFFN.gif)"
                                document.getElementsByClassName("margin")[0].style.backgroundImage="()"
                                document.getElementsByClassName("lines-content monaco-editor-background")[0].style.backgroundAttachment="fixed"
                                document.getElementsByClassName("margin")[0].style.backgroundAttachment="fixed"
                                document.getElementsByClassName("lines-content monaco-editor-background")[0].style.repeat="no-repeat"
                                document.getElementsByClassName("margin")[0].style.repeat="no-repeat"