style.css

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --text: #18191a;
    --bg: #F8FAFC;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Ubuntu", "Canterell", "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    color: var(--text);
    background-color: var(--bg);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    margin: 1rem 0;
}

svg {
    stroke: var(--text);
}

header {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

span {
    font-weight: 500;
}

main {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 60vh;
}

#content {
    font-size: 3em;
    word-break: break-all;
    text-align: center;
}

.nav_section {
    display: flex;
    justify-content: center;
}

ul {
    display: flex;
    list-style: none;
    justify-content: center;
    gap: 1rem;
}

li.active {
    border-bottom: 3px solid var(--text);
}