body{
    font-family: sans-serif;
}
h1{
    text-align: center;
    color:blue;
    
}
.gallery{
    width:240px;
    height:240px;
    border-radius: 10%;
}
.gallery img{
    
    filter:grayscale(100%);
    transition:1s;
}
.gallery img:hover{
    filter:grayscale(0);
    transform:scale(.90);
    
}