*{
    padding: 0px;
    margin: 0px;
    box-sizing: border-box;
}
.gallery{
    width: 100%;
    height: auto;
    text-align: center;
    margin: auto;
}
.gallery img{
    width: 200px;
    height:auto;
    transition: 0.5s;
}
.gallery img:hover{
    filter: grayscale(80%);
    transform: scale(1.02);
}