body {
    font-family: Arial, sans-serif;
    background: #f5f6f7;
    margin: 40px;
}

h1, h2 {
    margin-bottom: 10px;
}

table {
    border-collapse: collapse;
    width: 100%;
    background: #fff;
}

th, td {
    padding: 10px;
    border: 1px solid #ddd;
}

th {
    background: #f0f0f0;
    text-align: left;
}

.error {
    color: red;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}