.chat-btn {
    top: 0;
    right: 0;
    width: 100%;
    height: auto;
    z-index: 99;
    cursor: pointer;
    border: none;
  }

 .chat-btn-img {
    position: fixed;
    top: 0;
    right: 0;
    border-radius: 5px;
    box-shadow: 0px 3px 1px -2px rgba(0,0,0,0.2), 0px 2px 2px 0px rgba(0,0,0,0.14), 0px 1px 5px 0px rgba(0,0,0,0.12);
}

@media all and (max-width: 480px){
    .chat-btn {
        display: none;
    }
}