.watermark {
    opacity: 0;
}


body {
    /* Adjust background color if needed */
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='100' height='100' viewBox='0 0 100 100'%3E%3Cdefs%3E%3Cpattern id='grid' width='50' height='50' patternUnits='userSpaceOnUse'%3E%3Cpath d='M 10 0 L 0 0 0 10' fill='none' stroke='%23666666' stroke-width='2'/%3E%3C/pattern%3E%3C/defs%3E%3Crect width='100%' height='100%' fill='url(%23grid)'/%3E%3C/svg%3E");
    background-size: 10px 10px;
    /* Adjust size of the grid */
}