body {
    margin: 0;
    font-family: Arial, sans-serif;
    background-color: #f0f0f0;
}
.navbar {
    display: flex;
    justify-content: space-around;
    background-color: #333;
    padding: 14px 0;
}
.navbar a {
    color: white;
    text-decoration: none;
    padding: 14px 16px;
}
.section, .header {
    padding: 40px;
}
.header {
    background-image: url('image-header.jpg');
    background-size: cover;
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    text-align: center;
}
h1 {
    font-size: 36px;
}
h2 {
    font-size: 30px;
}
form {
    display: flex;
    flex-direction: column;
    width: 300px;
}
input, textarea {
    margin: 10px 0;
    padding: 10px;
}
input[type="submit"] {
    background-color: #50b3a2;
    border: none;
    color: white;
    cursor: pointer;
    padding: 15px;
}