#caja-what-ico{
    position: fixed;
    width: 55px;
    height: 55px;
    line-height: 50px;
    bottom: 110px;
    right: 35px;
    background: #25d366 ;
    color: white;
    border-radius: 50px;
    text-align: center;
    font-size: 35px;
    box-shadow: 0px 1px 10px rgba(0,0,0,0.3);
    z-index: 100;
}
#caja-what-ico:hover{
    text-decoration: none;
    color: #25d366;
    background: white;
}
@media(max-width: 767px){
    #caja-what-ico {
        bottom: 100px;
        right: 15px;
        width: 40px;
        height: 40px;
        line-height: 38px;
        font-size: 25px;

    }
    
}