body {
    background-color: #F2F0EB;
    font-family: "Times New Roman", Times, serif;
    color: #333;
}

main {
    width: 80%;
    max-width: 800px;
    margin: 4rem auto;
}

ul.directory {
    list-style-type: none;
    display: flex;
    margin: 0;
    padding: 0;
}

.directory li {
    margin-right: 1rem;
}

.directory li.active-item {
    font-weight: bold;
}

.directory li a {
    text-decoration: underline;
    color: #000;
}

.directory li a:hover {
    text-decoration: none;
}

.explanation {
    margin-top: 2rem;
    font-size: 1.1rem;
    line-height: 1.6;
    max-width: 600px;
}

a {
    color: #000;
    text-decoration: underline;
}

a:hover {
    text-decoration: none;
}

@media screen and (max-width: 600px) {
    main {
        width: 90%;
        margin: 2rem auto;
    }
    .explanation {
        max-width: 100%;
    }
}