Evet hocam böyle yazıyor.
"uses Markdown formatting, and some HTML" <style>
html, body {
background-image: url('[URL]https://i.imgur.com/tyzqpOC.jpg[/URL]') !important;
background-attachment: fixed !important;
background-position: center !important;
background-repeat: no-repeat !important;
background-size: cover !important;
height: 100% !important;
color: #CD5C5C !important;
}
</style>bunu html kod olarak yapıstırıp dener misiniz hocam