header {
    background: #4CAF50;
    color: #fff;
    padding: 16px;
    text-align: center;
}

.container {
    max-width: 1000px;
    margin: 30px auto;
    background: #fff;
    padding: 24px;
    border-radius: 10px;
    box-shadow: 0 10px 20px rgba(0,0,0,.08);
}

.invoice-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: 20px;
    font-size: 15px;
}

.invoice-info strong {
    color: #333;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    padding: 12px;
    border-bottom: 1px solid #e5e7eb;
    text-align: left;
}

th {
    background: #4CAF50;
    color: #fff;
}

tbody tr:hover {
    background: #f9fafb;
}

.total {
    text-align: right;
    font-size: 18px;
    margin-top: 20px;
    font-weight: bold;
}

.actions {
    margin-top: 30px;
    display: flex;
    justify-content: space-between;
}