#whatsappchat{position:fixed;z-index:9999;float:right;cursor:pointer;min-width:40px;max-width:200px;text-align:center;-webkit-transition:All .5s ease;-moz-transition:All .5s ease;-o-transition:All .5s ease;-ms-transition:All .5s ease;transition:All .5s ease;}

@media(max-width:767px){
    #whatsappchat{max-width:150px;}
    #whatsappchat .btn-web{display:none;}
}

@media(min-width:768px){
    #whatsappchat .btn-mobile{display:none;}
}