direction: rtl;
z-index: -1;
box-shadow: {
 -7px -7px 20px 0px #fff9,
 -4px -4px 5px 0px #fff9,
 7px 7px 20px 0px #0002,
 4px 4px 5px 0px #0001;
transition: all 0.3s ease;
}
.btn-16:hover {
color: #000;
}
.btn-16:hover:after {
left: auto;
right: 0;
width: 100%;
}
.btn-16:active {
top: 2px;
}