body {
    font-family: Arial, sans-serif;
    background-color: #0b1d3a;
    color: white;
    text-align: center;
    padding: 20px;
}
table {
    width: 100%;
    max-width: 600px;
    margin: auto;
    background-color: #1f3b5c;
    border-collapse: collapse;
    border-radius: 10px;
    overflow: hidden;
}
th, td {
    border: 1px solid #ccc;
    padding: 10px;
}
td[contenteditable] {
    background-color: #2a4b72;
}
.login-screen {
    max-width: 300px;
    margin: 100px auto;
}
.hidden {
    display: none;
}
button {
    background-color: #1a9fff;
    color: white;
    border: none;
    padding: 5px 10px;
    margin: 2px;
    border-radius: 5px;
}