#wachat a {
    position: fixed;
    z-index: 9999;
    right: 25px;
    bottom: 180px;
    cursor: pointer;
    color: #fff;
    text-align: center;
    padding: 10px;
    background: #20b038;
    -webkit-transition: All .5s ease;
    -moz-transition: All .5s ease;
    -o-transition: All .5s ease;
    -ms-transition: All .5s ease;
    transition: All .5s ease;
    border-radius: 70px;
    display: flex;
    justify-content: center;
    align-items: center;
}

#wachat a img{
	width: 36px;
}

@media only screen and (max-width: 768px) {
#wachat a {
    bottom: 210px;
}
}