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.watermark {
position: fixed;
bottom: 5px;
right: 5px;
opacity: 0.5;
z-index: 99;
color: white;
user-select: none;
}
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<!DOCTYPE html>
<html>
<head><title>watermark background</title>
#watermark {
position: fixed;
bottom: 5px;
right: 5px;
opacity: 0.5;
z-index: 99;
color: white;
user-select: none;
}
</head>
<body>
</body>
</html>