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

/* HEADER */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: #222;
    color: #fff;
    padding: 15px 20px;
}

nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
}

nav ul li {
    margin: 0 15px;
}

nav ul li a {
    color: #fff;
    text-decoration: none;
    font-weight: bold;
}

/* BANNER */
.banner {
    background: url('images/banner.jpg') no-repeat center center/cover;
    height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: white;
}

.banner-content {
    background: rgba(0, 0, 0, 0.6);
    padding: 20px;
    border-radius: 5px;
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    background: orange;
    color: white;
    text-decoration: none;
    font-weight: bold;
    margin-top: 10px;
    border-radius: 5px;
}

/* FOOTER */
footer {
    background: #222;
    color: white;
    text-align: center;
    padding: 10px 0;
    position: relative;
    bottom: 0;
    width: 100%;
}