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

header {
    background-color: #3498db;
    color: white;
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 20px;
}

.btn {
    display: inline-block;
    background-color: #2ecc71;
    color: white;
    padding: 8px 16px;
    border-radius: 4px;
    text-decoration: none;
    border: none;
    cursor: pointer;
}

.btn:hover {
    background-color: #27ae60;
}

.form-group {
    margin-bottom: 15px;
}

.form-control {
    width: 100%;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

.card {
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 15px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}