images as background html code example

Example 1: html watermark background

#watermark {
   position:fixed;
   bottom:5px;
   right:5px;
   opacity:0.5;
   z-index:99;
   color:white;
   user-select: none;
}

Example 2: how to put background in html

.background{
background-image:url(back.jpg);
background-size: cover;
background-attachment: scroll;
}