body {
    max-width: 650px;
    margin: 40px auto;
    padding: 0 10px;
    font: 18px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
    color: #444;
}

h1,h2,h3 {
    line-height: 1.1;
    margin: 0.1em 0;
}

ol {
    margin: 0.5em 0 1em;
}

em {
    color: #888;
}

@media (prefers-color-scheme: dark) {
    body {
        color: #c9d1d9;
        background: #0d1117;
    }
    
    a:link {
        color: #58a6ff;
    }
    
    a:visited {
        color: #8e96f0;
    }
}

.hourglass {
    display: block;
    margin: 0 auto 1em;
    width: 100px;
    animation: hourglass-flip 10s ease-out infinite;
    animation-delay: 5s;
}

@keyframes hourglass-flip {
    0% {
        transform: rotate(0deg);
    }
    5% {
        transform: rotate(-10deg);
    }
    10%, 100% {
        transform: rotate(180deg);
    }
}

.definition .header {
    display: flex;
    align-items: baseline;
    gap: 10px;
}