body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
}

header {
    top: 0;
    left: 0;
    width: 100%;
    background-color: #333;
    color: white;
    text-align: center;
    padding: 20px 0;
    z-index: 1000;
}

header nav button {
    margin: 0 15px;
    background-color: #555;
    color: white;
    border: none;
    padding: 10px 20px;
    cursor: pointer;
}

header nav button:hover {
    background-color: #777;
}

section {
    padding: 30px;
    margin-top: 80px;
    text-align: left;
}

section h1, section h2 {
    color: #333;
}

section p {
    color: #34495E;
    font-size: 18px;
    line-height: 1.6;
}

.l, .r {
    display: inline-block;
    width: 48%;
    margin: 10px 1%;
    vertical-align: top;
}

footer {
    text-align: center;
    background-color: #333;
    color: white;
    padding: 20px;
    margin-top: 40px;
}

footer p {
    margin: 0;
}