@media (max-width: 768px) {
            .card {
                margin-bottom: 20px;
            }
            .center-cards {
                justify-content: center;
            }
        }
.overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: rgba(0, 0, 0, 0.5);
  overflow: hidden;
  width: 100%;
  height: 0;
  transition: .5s ease;
}

.text {
  position: absolute;
  top: 50%;
  left: 50%;
  -webkit-transform: translate(-50%, -50%);
  -ms-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
  text-align: center;
}
.text a{
    text-decoration: none;
    font-family: 'Sevillana', Time News Roman;
     color: white;
    font-size: 35px;
}
.text a:hover{
    color: cyan ;
}

.card:hover .overlay{
           height: 100%;
           }

}  
div.custom-color:hover{
    text-transform: uppercase; border-bottom: 2px solid black
}