*{
margin: 0px;
padding: 0px;
box-sizing: border-box;
}

#myBtn {
    display: none;
    position: fixed;
    bottom: 20px;
    right: 30px;
    z-index: 99;
    font-size: 18px;
    border: none;
    outline: none;
    background-color: rgb(36, 35, 35);
    color: white;
    cursor: pointer;
    padding: 15px;
    border-radius: 4px;
  }
  
  #myBtn:hover {
    background-color: #555;
  }

@media screen and (max-width: 468px) {
    .bttn{
        width: 70px;
        font-size: 0.7rem;
    }
}