body {
 background-image: url(https://i.postimg.cc/sfB9Brj5/bf54cba23bdfcb69d60b83b1a71831fe.jpg); 
 display: grid;
 place-items: center; /* Centers both horizontally and vertically */
}

img {
 width: 100%; 
 filter: drop-shadow(3px 3px);
}

#content {
 width: 100%; 
}