body {
    font-family: sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: #f0f2f5;
    margin: 0;
}
.container {
    background: #fff;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    text-align: center;
    width: 90%;
    max-width: 600px;
}
h1 {
    color: #333;
    margin-bottom: 20px;
}
button {
    padding: 10px 20px;
    font-size: 16px;
    margin: 5px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}
#start-btn {
    background-color: #28a745;
    color: white;
}
#start-btn:hover {
    background-color: #218838;
}
#stop-btn {
    background-color: #dc3545;
    color: white;
}
#stop-btn:hover {
    background-color: #c82333;
}
button:disabled {
    background-color: #ccc;
    cursor: not-allowed;
}
.text-output {
    margin-top: 20px;
    padding: 15px;
    border: 1px solid #ddd;
    border-radius: 5px;
    background-color: #f9f9f9;
    min-height: 100px;
    text-align: left;
    white-space: pre-wrap;
}