#wrapper {
    padding: 0 20px;
}
textarea {
    width: calc(100% - 40px);
    height: 50px;
    margin: 10px 0;
    display: block;
}
#result {
    white-space: pre-line;
    background-color: #f0f0f0;
    padding: 10px;
    margin: 10px 0;
    border: 1px solid #ccc;
}
button {
    margin: 10px 0;
}