I couldn’t figure out how to have the chrome templates access data to see what page they’re on, so I wrote this script to add the “active” class to an element.

fix_css_has_run = false;
function fix_css(){
    fix_css_has_run = true;
    var url_arr = document.URL.split("/");
    var li_id = "";
    var after_samertm = false;
    for (var i = 0; i < url_arr.length; i++) {
        if (after_samertm) {
            li_id = url_arr[i];
            break;
        } else {
            if (url_arr[i] === "samertm.com") {
                after_samertm = true;
            }
        }
    }
    var elem = null;
    if (li_id == "") {
        elem = document.getElementById("home");
    } else {
        elem = document.getElementById(li_id);
    }
    elem.className = elem.className + " active";
};

document.addEventListener("DOMContentLoaded", fix_css, false);

// if DOMContentLoaded does not exist
window.onload = function() {
    if (!fix_css_has_run) {
    fix_css();
    }
};

Javascript saves the day once again!