#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: rgb(255, 225, 0);
    /* Set a background color */
    color: white;
    /* Text color */
    cursor: pointer;
    /* Add a mouse pointer on hover */
    padding: 15px;
    /* Some padding */
/*    border-radius: 500px;*/
    /* Rounded corners */
    font-size: 18px;
    /* Increase font size */
    width: 50px;
    height: 50px;
    clip-path: polygon(0 30%, 50% 0, 100% 30%, 80% 30%, 80% 100%, 20% 100%, 20% 30%);
}

#myBtn:hover {
    background-color: #555;
}