body {
    font-family: Arial, sans-serif;
    padding: 20px;
    background: #111;
    color: #eee;
}

h1 {
    text-align: center;
}

input, button {
    padding: 10px;
    margin: 5px 0;
    border-radius: 5px;
    border: none;
    outline: none;
    font-size: 16px;
}

input {
    width: 200px;
    display: block;
    margin: 10px auto;
}

button {
    background-color: #1e90ff;
    color: #fff;
    cursor: pointer;
    transition: background-color 0.2s;
}

button:hover {
    background-color: #0b61d0;
}

table {
    width: 50%;
    margin: 20px auto;
    border-collapse: collapse;
}

th, td {
    padding: 10px;
    text-align: center;
    border-bottom: 1px solid #555;
}

th {
    background: #222;
}

tr:hover {
    background: #333;
}

.container {
    width: 300px;
    margin: auto;
    text-align: center;
    padding: 20px;
    background: #1a1a1a;
    border-radius: 10px;
}

.error {
    color: #ff4d4d;
    margin-top: 10px;
}