body {
    padding: 20px;
}

h1 {
    text-align: center;
    margin-bottom: 20px;
}

.text-area {
    width: 100%;
    height: 100px;
    margin-bottom: 15px;
}

.btn {
    display: block;
    width: 100%;
    margin-top: 10px;
}

.container {
    max-width: 600px;
    margin: auto;
}