.app {
    font-family: Arial, sans-serif;
    width: 300px;
    margin: 0 auto;
    padding-top: 50px;
}

textarea {
    width: 100%;
    height: 100px;
}

button {
    display: block;
    width: 100%;
    padding: 10px;
    margin-top: 10px;
    background-color: #4CAF50;
    color: white;
    border: none;
    cursor: pointer;
}