body {
    font-family: Arial, sans-serif;
    background: #f3f3f3;
    margin: 0;
    padding: 0;
}
.container {
    max-width: 600px;
    margin: 50px auto;
    background: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
h1, h2, h3 {
    text-align: center;
}
form {
    margin-top: 10px;
}
input[type="text"] {
    padding: 5px;
    width: 100%;
    margin: 5px 0;
}
button {
    padding: 8px 12px;
    background: #007BFF;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
}
button:hover {
    background: #0056b3;
}
ul {
    list-style-type: none;
    padding: 0;
}
li {
    margin-bottom: 10px;
    padding: 5px;
    background: #eee;
    border-radius: 5px;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}
th, td {
    border: 1px solid #ccc;
    padding: 8px;
    text-align: center;
}
th {
    background-color: #f0f0f0;
}

button.btn-red {
    background-color: #dc3545 !important;
    cursor: not-allowed;
}