body{
    font-family: sans-serif;
}
h1{
    text-align: center;
    color: forestgreen;
    margin: 30px 0px 50px;
}
.gallery{
    margin: 10px 50px;
}
.gallery img{
    width: 230px;
    padding: 25px;
    filter: grayscale(10%);
    transition: 1s;
}
.gallery img:hover{
    filter:grayscale(0%);
    transform: scale(1.5);
}