.thumbnail {
    height: 100%;
    width: 100%;
    overflow: hidden;
    }

    .thumbnail img {
        -webkit-transition: all 0.5s ease;
    }

    .thumbnail img:hover {
        transform: scale(1.6);
    }

    .thumbnail2 {
        height:100%;
        width: 100%;
        overflow: hidden;
        }
    
        .thumbnail2 img {
            -webkit-transition: all 0.5s ease;
        }
    
        .thumbnail2 img:hover {
            transform: scale(2.5);
        }