section.culc-wrap {
    text-align: center;
    margin: 1.5em 0;
}
section.culc-wrap p {
    margin-bottom: 0.8em;
}
div.culc {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.6em;
}
div.culc span {
    font-size: 1.2em;
    font-weight: bold;
}
div.culc input.culc-num,
div.culc input.culc-ans {
    padding: 0.4em 0.8em;
    width: 4em;
    text-align: center;
}