.kpd_btn div{
    box-shadow: inset 0 -2px 24px #9BE3EE;
    transform: box-shadow .4s ease-in;
}

/*
.kpd_btn :hover div{
    box-shadow: inset 0 -2px 48px #9BE3EE;    
}

.kpd_btn :active div{
    box-shadow: none;    
}*/