.btn:hover {
  background-color:black;
}

.hover-container {
           position: relative;
       }

       .overlay {
           position: absolute;
           bottom: 0;
           left: 0;
           right: 0;
           overflow: hidden;
           width: 100%;
           height: 0;
           transition: .5s ease;
           display: flex;
           align-items: center;
           justify-content: center;
       }

       .hover-container:hover .overlay {
           height: 15%;
       }

.projects-selection {
  padding: 5rem 0
}