ul#menu {
    margin: 0;
    padding: 0;
    list-style-type: none;
}
ul#menu li {
    display: inline;
    margin: 0 1em 0 0;
    padding: 0;
}
ul#menu li:last-child {
    margin-right: 0;
}

h1{counter-reset:h2;}
h2{counter-reset:h3;}
h3{counter-reset:h4;}
h4{counter-reset:h5;}
h5{counter-reset:h6;}
h2::before{counter-increment:h2;content:counter(h2)". ";}
h3::before{counter-increment:h3;content:counter(h2)"."counter(h3)". ";}
h4::before{counter-increment:h4;content:counter(h2)"."counter(h3)"."counter(h4)". ";}
h5::before{counter-increment:h5;content:counter(h2)"."counter(h3)"."counter(h4)"."counter(h5)". ";}
h6::before{counter-increment:h6;content:counter(h2)"."counter(h3)"."counter(h4)"."counter(h5)"."counter(h6)". ";}