body {
    font-family: georgia, times-new-roman, serif;
    font-size: 1.10em;
}

h1 {
    font-family: helvetica, arial, sans-serif;
    font-variant-caps: small-caps;
    font-size: 3em;
}

h1:after {
    content:' ';
    display:block;
    border:2px solid #a0a0a0;
}

h2, h3, h4, h5, h6 {
    font-family: helvetica, arial, sans-serif;
}

.main {
    width: 50rem;
    max-width: 100vw;
    margin-inline: auto;
}

.yt {
    position: relative;
    display: block;
    width: 100%;
    height: 0; /* height is achieved by the padding */
    margin: auto;
    padding: 0% 0% 56.25%; /* 16:9 aspect ratio */
    overflow: visible;
}

.yt iframe {
    position: absolute;
    top: 0; bottom: 0; left: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

.pseudo-arxiv {
    font-family: "Lucida Grande", Helvetica, Arial, sans-serif;
    margin-top: 1em;
    margin-bottom: 1em;
    margin-left: 0;
    margin-right: 0;
}

.pseudo-arxiv span.meta {
    font-size: 0.8em;
}

.pseudo-arxiv span.title {
    font-size: 1.0em;
    font-weight: 700;
}

.pseudo-arxiv div.abstract {
    font-size: 0.9em;
    margin-inline-start: 40px;
}