change link color
change visited & unvisited link color
if you don't like default color, change it to any valid CSS color you want
// unvisited link color
let enable_link = true;
let ex = "DeepPink";
let eh = "DeepPink";
// visited link color
let enable_visited = true;
let ex_v = "gray";
let eh_v = "gray";
because of the security risk, visited link color many not work in some browser
see https://dbaron.org/mozilla/visited-privacy