sectionheaders.css

body {
    counter-reset: h1section;
}

section h1:before{
    content: counter(h1section) ". ";
    counter-increment: h1section;
}
section h1 {
    counter-reset: h2section;
}
section h2:before{
    content: counter(h1section) "." counter(h2section) ". ";
    counter-increment: h2section;
}
section h2 {
    counter-reset: h3section;
    
}
section h3:before{
    content: counter(h1section) "." counter(h2section) "." counter(h3section) ". ";
    counter-increment: h3section;
}
section h3 {
    counter-reset: h4section;
}
section h4:before{
    content: counter(h1section) "." counter(h2section) "." counter(h3section) "." counter(h4section) ". ";
    counter-increment: h4section;
 
}
section h4 {  
    counter-reset: h5section;
}
section h5:before{
    content: counter(h1section) "." counter(h2section) "." counter(h3section) "." counter(h4section) "." counter(h5section) ". ";
    counter-increment: h5section;
}

section h5 {
    counter-reset: h6section;
}
section h6:before{
    content: counter(h1section) "." counter(h2section) "." counter(h3section) "." counter(h4section) "." counter(h5section) "." counter(h6section) ". ";
    counter-increment: h6section;
    
}