Dark mode GUI needs some fixing

[piterq]

There is improper bright background in the header:

The summary (total) row is hard to read due to grey backgroud:

Suggested fixes

1. Remove this line from details.js:

tc = (pc >= 80 ? 'white' : '#404040');

2. Change this code in wrtbwmon.css file:

.tr.table-totals {
    background: #e0e0e0 !important;
}

to this code:

.tr.table-totals {
    font-weight: bold;
}

[HahahahaChen]

I think you can make a pull request