I've been attempting to add a vertical bar that stays fixed to the top right corner of my screen, but for some reason, it's not showing up no matter what I try. Here is the CSS code I'm using for my site, everything seems normal except that the bar doesn't appear where it's supposed to be. Even though the CSS indicates it should be at the top, it shows up at the bottom of the site according to the inspect element feature. Take a look at the last few lines of the CSS code related to the bar.
body {
/* CSS styling */
}
/* Other CSS classes and styles */
#gradient-bar {
background: linear-gradient(to right, #000000, #ffffff);
height: 20px;
width: 100%;
}