html {
    background-color: yellowgreen;
}

div {
    background-color: white;
    padding: 10px;
    border-radius: 10px;
    border: 2px solid black;
    margin: auto;
    width: 50vw;
}

div h1 {
    text-align: center;
}

ul {
list-style-type: square;

}

ol {
list-style-type: upper-roman;
}

ul ul {
list-style-type: circle;
}