.shadow-block {
  box-shadow: 0 0 4px 2px rgba(0,0,0,0.2);
}
.shadow-top {
  box-shadow: 0 -2px 4px 0 rgba(0,0,0,0.2);
}
.shadow-bottom {
  box-shadow: 0 2px 4px 0 rgba(0,0,0,0.2);
}