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

.header {
    background: #333;
    color: #fff;
    padding: 15px;
    text-align: center;
}

.container {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 220px;
    background: #2c3e50;
    padding: 20px;
    color: white;
}

.sidebar a {
    color: white;
    text-decoration: none;
    display: block;
    margin: 10px 0;
}

.sidebar a:hover {
    text-decoration: underline;
}

.main {
    flex: 1;
    background: white;
    padding: 20px;
}

button {
    background: #3498db;
    color: white;
    border: none;
    padding: 10px 20px;
    cursor: pointer;
    font-size: 16px;
}

button:hover {
    background: #2980b9;
}

input[type="text"], textarea, select {
    width: 100%;
    padding: 10px;
    margin: 10px 0 20px 0;
    border: 1px solid #ccc;
    box-sizing: border-box;
}