HN but it is not an eyesore

hn.css

#hnmain,
html,
#hnmain td {
    background-color: #0f111a;
}

#hnmain {
    margin: 2rem 0;
}

body {
    font-size: 1.5rem !important;
    max-width: 800px;
    margin: auto;
}
a:link {
    color: #D5D6DD;
}
.pagetop a:visited {
    color: #D5D6DD;
}
.hnname a {
    color: #ff6600 !important;
}
.title {
    font-size: 1.5rem;
    font-weight: 600;
}
.hnmore a:link,
a:visited,
.title,
.default,
.subtext,
.c00,
.c00 a:link,
.subtext a:link,
.subtext a:visited,
.comhead,
.pagetop,
body,
.c00 .reply a:link,  
.reply a:link{
    color: #8F93A2
}

.comhead {
    display: block;
    padding: 0.25rem 0;
}
.subtext,
.c00,
.c00 a:link {
    font-size: 16px;
}
.default {
    font-size: 14px;
}

.itemlist {
    margin: 2rem 0 0;
}
#pagespace {
    height: 3rem !important;
}
.itemlist tr td {
    padding: 1rem 0.25rem 0;
}
.itemlist tr td.subtext {
    padding: 0 0.25rem 1rem;
}
.votearrow {
    margin-top: 0.5rem;
    opacity: 0.5;
}
.itemlist tr td.votelinks {
    padding: 1rem 0 0;
}

textarea, input {
    border: 1px solid #8F93A280;
    border-radius: 0.5rem;
    padding: 0.5rem;
    background: rgba(255, 255, 255, 0.05);
}

input:hover {
    background: rgba(255, 255, 255, 0.1);
}

.c00 .reply a:link,  .reply a:link {
    font-size: 0.75rem;
}

HN.md

HN but it is not an eyesore

Use Stylus, copy the CSS, tweak colors etc.