miniflux-legacy/examples/mytheme/css/app.css

@font-face {
    font-family: Inconsolata;
    src: url(../fonts/Inconsolata-Regular.ttf);
}

body {
    margin-left: 300px;
    padding-left: 10px;
    border-left: 5px solid #000;
    font-family: 'Inconsolata', sans-serif;
}