.container {
    padding: 20px;
    text-align: center;
}
.ref input {
    margin: 10px;
    padding: 8px;
    text-align: center;
}
.ref button {
    padding: 8px 16px;
    cursor: pointer;
}
.ref .url-display {
    margin-top: 10px;
    font-size: 18px;
    word-wrap: break-word;
}