html, body {
    font-family: "Roboto", "Roboto Light", "Times New Roman", serif;
    line-height: 1.15;
}

header, main, aside, footer {
    padding: 1rem;
}

header h1 {
    font-size: 2rem;
    font-weight: bolder;
}

header a {
    text-decoration: none;
}

header a:hover {
    text-decoration: underline;
}

header a img {
    width: 1em;
    margin-right: 0.2em;
}

main h1 {
    font-size: 1.5rem;
    font-weight: bolder;
    margin-bottom: 0.5em;
}

h1:not(:first-child), h2:not(:first-child) {
    margin-top: 0.5em;
}

h2 {
    font-size: 1.25rem;
    font-weight: bolder;
    margin-bottom: 0.5em;
}

h3 {
    font-size: 1.15rem;
}


.period {
    font-size: 0.75em;
}

p {
    margin-bottom: 0.5em;
    margin-top: 0.5em;
    text-align: justify;
}

a[href^="https://youtu.be/"] {
    display: none;
}

li:not(:last-child) {
    margin-bottom: 0.4em;
}


footer a {
    text-decoration: none;
}

iframe {
    width: 560px;
    aspect-ratio: 16 / 9;
}