body {
    font-family: Cambria, Cochin, Georgia, Times, 'Times New Roman', serif;
    background-color: #f9f9f9;
    /* Light gray */
    color: #333;
    /* Dark gray */
    margin: 0;
    padding: 0;
    font-size: larger;
}

header {
    background-color: #333;
    /* Dark gray */
    padding: 15px;
    text-align: center;
    border-radius: 8px;
    color: #fff;
    /* White */
}

nav {
    background-color: #666;
    /* Medium gray */
    text-align: center;
    font-size: larger;
    border-radius: 8px;
}

nav ul {
    margin: 0;
    padding: 0;
    list-style-type: none;
}

nav ul li {
    display: inline-block;
    margin-right: 20px;
}

nav ul li:last-child {
    margin-right: 0;
}

nav ul li a {
    color: #fff;
    /* White */
    text-decoration: none;
    font-size: 16px;
}

.menu-btn {
    display: none;
}


section {
    padding: 20px;
}

footer {
    background-color: #333;
    /* Dark gray */
    padding: 10px;
    border-radius: 8px;
    text-align: center;
    color: #fff;
    /* White */
}

.person {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    margin-bottom: 20px;
}

.person img {
    max-width: 100%;
    height: auto;
}

.cta-button {
    text-align: center;
    margin: 20px 0;
}

.cta-button button {
    padding: 10px 20px;
    font-size: 16px;
    background-color: #0d0080;
    /* Green */
    border-radius: 4px;
    color: #fff;
    /* White */
    border: none;
    cursor: pointer;
}

.close {
    position: fixed;
    top: 10px;
    right: 10px;
    font-size: 20px;
    cursor: pointer;
    color: orangered;
    font-size: 50px;
}

.close:hover {
    color: #000;
}

.btn-primary {
    background-color: gold;
    border-color: red;
    color: #fff;
    padding: 10px 20px;
    font-size: 16px;
    border-radius: 4px;
    cursor: pointer;
    position: fixed;
}

.btn-primary:hover {
    background-color: #0056b3;
    border-color: #0056b3;
}

@media screen and (min-width: 768px) {
    .container {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
    }

    section {
        flex: 0 0 33.333%;
        max-width: 33.333%;
    }
}