LSJ:DarkTheme

You can paste the following code in Stylus (an extension for Chrome, Firefox or Opera) and have lsj.gr displayed in a dark theme.

Dark theme

* {
background: #262626 !important;
border-color: #3e3e3e !important;
color: #e9e6e6 !important;
}

a:link {
color: #a7a15e !important;
}

pre,
a:visited {
color: #a67b07 !important;
}

h1,
h1 *,
h2,
h2 *,
h3,
h3 *,
h4,
h4 *,
h5,
h5 *,
h6,
h6 *,
a:hover {
color: #556b2f !important;
}

b,
b *,
strong,
strong * {
color: #af5f00 !important;
font-weight: normal !important;
}

li,
i,
i * {
color: #e9e6e6 !important;
}

input,
button,
select,
textarea {
background: #262626 !important;
border: 1px solid #3e3e3e !important;
}

ul {
list-style-image: none !important;
}

#simpleSearch label{
background: none !important;
}
a.new, .new a {
color: #98bfe7 !important;
}
#mw-editbutton-link, span.oo-ui-iconElement-icon.oo-ui-icon-link {
    background-color: #ce5149 !important;
}
.mw-wiki-logo {
    background-image: url(/images/a/ae/LogoD.png) !important;
    background-repeat: no-repeat !important;
    display: block !important;
    content: '' !important;
    width: 11em !important;
    height: 11em !important;
    background-position: 50% 50% !important;
    margin: 0.75em auto 0 !important;
}