body { 
    font-family: ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Cantarell,Noto Sans,sans-serif,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans",sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol","Noto Color Emoji";
    background-color: #263238;
}
h1 {
    color: #eceff1;
    text-shadow: #000000f0 0.1rem 0.1rem 0.25rem;
}
.img1 {
    width: calc(100% - 5rem);
    max-width: 640px;
    height: auto;
    border: 1px solid #eceff1;
    border-radius: 0.25rem;
    box-shadow: #000000f0 0.5rem 0.5rem 0.25rem;
}
.centered {
    text-align: center;
}