.chat-launcher-btn {
    position: fixed;    
    bottom: 12px;
    right: 20px;
    /*background-color: #0078d4;
        border-radius: 50%;
    */
    color: white;
    width: 80px;
    height: 80px;
    font-size: 24px;
    text-align: center;
    line-height: 60px;
    cursor: pointer;
    z-index: 9999;
    background-image: url(../Content/images/客服報馬仔_黃.png);
    background-size: cover;
    background-repeat: no-repeat;
    background-position: center;
}

    .chat-launcher-btn.chat-opened {
        /*background-color: #005a9e;*/
    }

@media (max-width: 480px) {
    .chat-launcher-btn {
        width: 50px;
        height: 50px;
        font-size: 18px;
        line-height: 50px;
    }
}