body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    margin: 0;
    padding: 20px;
}

h1 {
    text-align: center;
}

.login-container {
    max-width: 400px;
    margin: 50px auto;
    padding: 20px;
    background: #fff;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

form label {
    display: block;
    margin: 10px 0 5px;
}

form input, form textarea, form button {
    width: 100%;
    padding: 10px;
    margin-bottom: 10px;
}
body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 20px;
    transition: background 0.3s, color 0.3s;
}

body.light {
    background: #ffffff;
    color: #000000;
}

body.dark {
    background: #121212;
    color: #ffffff;
}

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

table, th, td {
    border: 1px solid #cccccc;
}

th, td {
    padding: 10px;
    text-align: left;
}

tr.even {
    background-color: #f9f9f9;
}

tr.odd {
    background-color: #e0e0e0;
}

tr.completed {
    background-color: #8bc34a;
    color: #ffffff;
}

#theme-toggle {
    padding: 10px 20px;
    margin-bottom: 20px;
    cursor: pointer;
}