body {
    font-family: Arial, sans-serif;
    padding: 20px;
}
* {
  box-sizing: border-box;
}
#app {
    max-width: 600px;
    margin: auto;
}

input, button, textarea {
    margin: 10px 0;
    padding: 10px;
    width: 100%;
}

#output {
    margin-top: 20px;
    padding: 10px;
    background-color: #f0f0f0;
    border: 1px solid #ddd;
}

textarea {
  font-family: arial, sans-serif;
}