.next {
    float: right;
    margin: 40px auto;
    }

 .back{
    float: left;
    margin: 40px auto;
    }



    .page-header {
    margin: 0px 0 5px;
    padding: 0;
    border-bottom: none;
    text-align: center;
}

p{
    text-align: justify;
    text-justify: inter-word;
}


.nav {
    visibility: hidden;
}