body {
    font-family: Arial, sans-serif;
    background-color: #e3fcec;
    color: #065f46;
    margin: 0;
    padding: 0;
    text-align: center;
}
header {
    background: #065f46;
    padding: 20px;
    color: white;
}
nav a {
    color: white;
    margin: 0 15px;
    text-decoration: none;
}
main {
    padding: 20px;
}