html {
    background-color: lightyellow;
}

img {
    max-height: 300px;
    width: auto;
    margin: 20px;
}

p, ol, ul {
    max-width: 80%;
    margin: 20px;
    color: darkolivegreen;
}

h1, h2, h3 {
    text-align: center;
    color: darkslategrey;
}