body {
    font-family: sans-serif;
    max-width: 600px;
    margin: 40px auto;
    line-height: 1.6;
}

input,
button {
    display: block;
    width: 100%;
    margin-bottom: 10px;
    padding: 10px;
    box-sizing: border-box;
}

#output {
    background: #f4f4f4;
    padding: 10px;
    white-space: pre-wrap;
    border: 1px solid #ccc;
}

#url {
    margin-bottom: 10px;
    color: #666;
    white-space: pre-wrap;
}