#myBtn {
    display: none; /* Hidden by default */
    position: fixed; /* Fixed/sticky position */
    bottom: 5px; /* Place the button at the bottom of the page */
    right: 12px; /* Place the button 30px from the right */
    z-index: 99; /* Make sure it does not overlap */
    border: none; /* Remove borders */
    outline: none; /* Remove outline */
    cursor: pointer; /* Add a mouse pointer on hover */  
    opacity: 0.5; 
  }
  
#myBtn:hover {
  background-color: none; /* Add a dark-grey background on hover */
  opacity: 1; 
}