body {
    font-family: "Pridi", serif;
    background-color: #f0f0f0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.login-container, .grades-container {
    background-color: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    width: 400px;
}

h2 {
    margin-bottom: 20px;
    text-align: center;
}

input[type="text"], input[type="password"] {
    width: -moz-available;
    width: -webkit-fill-available;
    padding: 10px;
    margin: 10px 0;
    border: 1px solid #ccc;
    border-radius: 4px;
}

button {
    width: 100%;
    padding: 10px;
    background-color: #ff8f00;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

button:hover {
    background-color: #ffb300;
}

.error-message {
    color: red;
    text-align: center;
    display: none;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

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

th {
    background-color: #f2f2f2;
}

#logout-button {
    margin-top: 20px;
    background-color: #f44336;
}

/* รหัส CSS ทั้งหมดก่อนหน้า */

#student-info {
    margin-bottom: 20px;
}

#student-info p {
    margin: 5px 0;
    font-size: 1rem;
}