.gallery{
    height: 100%;
    width: 100%;
    padding-top: 14vh;
    background-image: linear-gradient(rgba(4, 9, 30, 0.913),rgb(2, 4, 14)),url(assets/background.jpg);
    background-position: center;
    background-size: cover;
}
.gallery img{
    height: 200px;
}
.gallery img:hover{
    transition: 1s;
    height: 230px;
}