Answers for "bootsrap hover cards"

shadow on hover class on card bootstrap

.card-product {
  &:hover {
    box-shadow: 0 8px 17px 0 rgba(0,0,0,0.2), 0 6px 20px 0 rgba(0,0,0,0.19);
    transition: all .55s ease-in-out;
  }
}

bootstrap card hover effect

.card{
  border-radius: 4px;
  background: #fff;
  box-shadow: 0 6px 10px rgba(0,0,0,.08), 0 0 6px rgba(0,0,0,.05);
  transition: .3s transform cubic-bezier(.155,1.105,.295,1.12),.3s box-shadow,.3s -webkit-transform cubic-bezier(.155,1.105,.295,1.12);
  padding: 14px 80px 18px 36px;
  cursor: pointer;
}

.card:hover{
  transform: scale(1.05);
  box-shadow: 0 10px 20px rgba(0,0,0,.12), 0 4px 8px rgba(0,0,0,.06);
}