You can use an extension to add css to websites (I use Stylus in Firefox). This way you can customize the current dark theme further to your liking.
For now I have these edits that I use in combination with the current dark theme:
html {
background-color: #000000;
}
.d-header {
background-color: #114821f0;
}
.custom-footer {
background-color: #000000;
border-top: 2px dashed #1a1919;
margin-top: 5em;
}