/* button */
 #myBtn {
     display: none;
     /* Hidden by default */
     position: fixed;
     /* Fixed/sticky position */
     bottom: 20px;
     /* Place the button at the bottom of the page */
     right: 30px;
     /* Place the button 30px from the right */
     z-index: 99;
     /* Make sure it does not overlap */
     border: none;
     /* Remove borders */
     outline: none;
     /* Remove outline */
     background-color: #CC1515;
     /* Set a background color */
     color: white;
     /* Text color */
     cursor: pointer;
     /* Add a mouse pointer on hover */
     padding: 15px;
     /* Some padding */
     border-radius: 10px;
     /* Rounded corners */
     font-size: 18px;
     /* Increase font size */
 }

 #myBtn:hover {
     background-color: #555;
     /* Add a dark-grey background on hover */
 }