miniflux-theme.css

@font-face {
    font-family: 'oldherl-songti';
    font-weight: bold;
    src: local('STZhongsong');
}
@font-face {
    font-family: 'oldherl-songti';
    font-weight: 500;
    src: local('STZhongsong');
}
@font-face {
    font-family: 'oldherl-songti';
    font-weight: regular;
    src: local('STSong'), local('Simsun');
}

:root{
--entry-content-font-family: var(--font-family);
--font-family: "Source Sans Pro", "PT Sans","Lato",  "DejaVu Sans", "Droid Sansx",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen-Sans,Ubuntu,Cantarell,"Helvetica Neue", "Source Han Sans SC", "Noto Sans CJK SC", "WenQuanYi Zen Hei", "Droid Sans Fallback", Verdana, "Microsoft YaHei", sans-serif;
--serif-font-family: "Zilla Slab", "Roboto Slab", "Arvo", "Rockwell", "TypoPRO Zilla Slab", "Source Serif Pro", "PT Serif", "Noto Serif", "Droid Serif", "Cambria", "Georgia", "Source Han Serif SC", "Noto Serif CJK SC", 'Times New Roman', Times, "oldherl-songti", STKaiTi, KaiTi, SimSun, serif;
--entry-content-quote-font-family: var(--serif-font-family);
--body-color: #000;
--title-color: #111;
--entry-content-color: #000;
--entry-content-code-color: #000;
--item-status-read-title-link-color: #444;
--item-status-read-title-focus-color: #444;
}
textarea[name=custom_css] {
width: 100%;
height: 300px;
}
h1, h2, h3 {
font-family: var(--serif-font-family);
font-weight: 500;
}
.entry-content {
    font-weight: 400;
}
.item-meta-info, .item-meta {
    font-size: inherit;
}

.header a {
    font-size: inherit;
}
.item-meta ul {
    margin-top: 0px;
}
.item-header {
    margin-bottom: 5px;
}
@media (min-width: 800px) {
body {
    max-width: 990px;
}
}

挺好看的，建议增加首行缩进：
.entry-content {
font-weight: 400;
text-indent: 2em;
}

适配宽屏：
@media (min-width: 800px) {
body {
max-width: 1200px;
}

挺好看的，建议增加首行缩进： .entry-content { font-weight: 400; text-indent: 2em; }

适配宽屏： @media (min-width: 800px) { body { max-width: 1200px; }

谢谢，但我不打算更改这几点。