header h1 {
    font-family: monospace;
    font-size: 2.2em;
}

main {
    max-width: 100%;
}

article {
    max-width: 80em;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-evenly;
    gap: 2em;
}

section {
    max-width: 25em;
}

summary {
    margin: 0.5em;
    padding: 0.5em;
    text-align: center;
    background-color: #ddd;
    font-weight: bold;
}

main p {
    line-height: 140%;
}

.symbol {
    text-align: center;
}

.symbol img {
    width: 20em;
    height: auto;
}

summary {
    background: var(--bg4);
}

li {
    margin-bottom: 0.5em;
}