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

header {
    background: #35424a;
    color: #ffffff;
    padding: 10px 0;
    text-align: center;
}

header ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
}

header ul li {
    float: left;
}

header ul li a {
    display: block;
    text-align: center;
    padding: 14px 16px;
    color: white;
    text-decoration: none;
}

header ul li a:hover {
    background-color: white;
    color: #35424a
}

h1 {
    margin: 0;
}

main {
    padding: 20px;
}

section {
    background: #ffffff;
    margin: 20px 0;
    padding: 20px;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

h2 {
    color: #35424a;
}

footer {
    text-align: center;
    padding: 10px 0;
    background: #35424a;
    color: #ffffff;
    position: relative;
    bottom: 0;
    width: 100%;
}


.active {
    background-color: white;
    color: #35424a;
    display: block;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
}