body {
    margin-left: 10%;
    margin-right: 10%;
    margin-top: 10%;
    margin-bottom: 10%;
    text-align: justify
    }
h1 {
    text-align: center;
    font-size: medium;
    margin-top: 3em;
    margin-bottom: 1.5em
    }
h1.title {
    text-align: center;
    font-size: x-large
    }
h3.author {
    text-align: center
    }
h4.date {
    text-align: center
    }