仪表盘-外观-主题文件编辑器-header.php</head>前。
<script>const style = document.createElement('style');
style.textContent = `
body {
background-attachment: fixed;
background-position: 0% 0%;
background-size: cover;
background-repeat: no-repeat;
}
`;
document.head.appendChild(style);</script>