header{
    display: block;
    width: 80%;
    margin-left: 10%;
    text-align: center;

}
p{
    font-family: 'Times New Roman', Times, serif;
    text-align: justify;
    margin-left: 10%;
    width: 80%;
}
h1,h2,h3{
    margin-left: 10%;
    width: 90%;
    margin-bottom: 1em;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

footer{
    margin-top: 4em;
    display: block;
    width: 100%;
    text-align: center;
    background-color: gray;
    position: relative;
}
ol{
    width: 80%;
    margin-left: 12%;
}