body {
    font-family: Arial, sans-serif;
    background: #1e1e1e;
    color: white;
    text-align: center;
    margin: 0;
}

header {
    background: #222;
    padding: 15px;
}

button {
    padding: 10px 15px;
    background: #ff9800;
    border: none;
    color: white;
    cursor: pointer;
    font-size: 16px;
}

#filters {
    margin: 20px 0;
}

input, select {
    padding: 10px;
    font-size: 16px;
    margin: 5px;
}

#marketplace {
    margin-top: 20px;
}

.item {
    background: #333;
    padding: 10px;
    margin: 10px auto;
    width: 200px;
    border-radius: 5px;
}