p {
    margin-top: 0.75em;
    text-align: justify;
    margin-bottom: 0.75em
    }
h1, h2, h3, h4, h5, h6 {
    text-align: center;
    clear: both
    }
body {
    margin-left: 15%;
    margin-right: 15%
    }
.center {
    text-align: center
    }
.figcenter {
    margin: auto;
    text-align: center
    }
.tn {
    margin: 5em auto 5em auto;
    text-align: center;
    border: 1px solid silver;
    padding: 1em;
    background: #f5f5f5
    }