#chap_2_6{
    display: inline;
    float: left;
    width: 45%;
}

#chap_7_10{
    display: inline;
    float: right;
    width: 45%;
}


table {
    margin-left: auto;
    margin-right: auto;
}

td, th {
    padding-left: 1rem;
    padding-right: 1rem
}

h1 {
    text-align: center;
}