body {
    font-family: Arial, sans-serif;
    margin: 20px;
    background-color: #f4f4f4;
    color: #333;
}

h1, h2 {
    color: #333;
}

button {
    background-color: #4CAF50;
    color: white;
    border: none;
    padding: 10px 20px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    margin: 4px 2px;
    cursor: pointer;
    border-radius: 4px;
}

button:hover {
    background-color: #45a049;
}

.popup {
    width: 300px;
    padding: 20px;
    border-radius: 8px;
}

.popup .close {
    font-size: 24px;
    color: #aaa;
}

.form-group {
    margin-bottom: 15px;
}

.footer {
    text-align: center;
    margin-top: 300px;
    font-size: 16px;
}

h1 {
    font-size: 2em;
    margin-bottom: 10px;
}

h2 {
    font-size: 1.5em;
    margin-top: 20px;
    margin-bottom: 10px;
}

pre {
    background-color: #eaeaea;
    padding: 10px;
    border-radius: 4px;
}

input[type="text"], input[type="password"] {
    width: 100%;
    padding: 10px;
    margin: 5px 0 10px 0;
    display: inline-block;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box;
}

.popup {
    display: none;
    position: fixed;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    border: 1px solid #888;
    box-shadow: 0px 0px 10px 0px #888;
    background-color: white;
    padding: 20px;
    z-index: 9;
    max-height: 80%;
    width: 80%;
    overflow-y: auto;
}

.popup .close {
    float: right;
    cursor: pointer;
}