body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: #f2f2f2;
    color: #333;
}
header {
    background: #0077b6;
    color: white;
    padding: 1.5em 1em;
    text-align: center;
}
.logo {
    width: 150px;
}
nav {
    background: #023e8a;
    padding: 1em;
}
nav ul {
    list-style-type: none;
    padding: 0;
    display: flex;
    justify-content: center;
}
nav ul li {
    margin: 0 1em;
}
nav ul li a {
    color: white;
    text-decoration: none;
}
section {
    padding: 2em;
    background: white;
    margin: 1em auto;
    width: 80%;
    box-shadow: 0px 0px 10px rgba(0,0,0,0.1);
}
.join-button {
    display: inline-block;
    padding: 10px 20px;
    background: #0096c7;
    color: white;
    text-decoration: none;
    border-radius: 5px;
}
footer {
    text-align: center;
    padding: 1em;
    background: #03045e;
    color: white;
}