https://www.omu.edu.tr/sites/all/themes/anasayfa/js/theme.js

1// Dark mode switch
2var sw = document.querySelector('#color_scheme_switch');
3var current_scheme = localStorage.getItem('color_scheme');
4
5if (current_scheme) {
6    document.documentElement.setAttribute('data-color-scheme', current_scheme);
7    sw.checked = (current_scheme === 'dark');
8}
9
10function changeTheme() {
11    if (sw.checked) {
12        document.documentElement.setAttribute('data-color-scheme', 'dark');
13        localStorage.setItem('color_scheme', 'dark');
14    } else {
15        document.documentElement.setAttribute('data-color-scheme', 'light');
16        localStorage.setItem('color_scheme', 'light');
17    }
18}
19
20if (sw) {
21    sw.addEventListener('change', changeTheme);
22}