body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f9f9f9;
    color: #333;
}

header {
    position: relative;
    background: url('../img/extern-bureaublad-1024x638-1.webp') no-repeat center center;
    background-size: cover;
    color: white;
    padding: 40px 20px;
    text-align: center;
}

header::after {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1;
}

header h1, header p {
    position: relative;
    z-index: 2;
}

header h1 {
    margin: 0;
    font-size: 2.5em;
}

main {
    padding: 20px;
    max-width: 1200px;
    margin: 0 auto;
}

section {
    background: white;
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

section h2 {
    color: #07AAF9;
    margin-top: 0;
}

footer {
    background-color: #2D2E43;
    color: white;
    text-align: center;
    padding: 10px 0;
    margin-top: 20px;
}

.container {
    display: flex;
    gap: 50px;
}

.upstreamcon {
    border: 2px solid #07AAF9;
    border-radius: 8px;
    padding: 10px;
    width: 45%;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}