#nhvalink {
    position: fixed;
    bottom: 25px;
    right: 25px;
    height: 50px;
    width: 50px;
    border: 0px;
    border-radius: 30px;
    cursor: pointer;
    outline: none;
    z-index: 10000000;
}
#nhvalink:hover {
}
#nhvalink_leftimg {
    position: absolute;
    cursor: pointer;
    float: left;
    border: 0px solid #ffffff;
    width: 50px;
    height: 50px;
	filter: drop-shadow(0 3px 4px rgba(255, 255, 255, 0.9));
}