.irc-calculator {
    max-width: 420px;
    padding: 20px;
    border: 1px solid #ddd;
    background: #fafafa;
}

.irc-calculator label {
    display:block;
    margin-top:10px;
    font-weight:600;
}

.irc-calculator input,
.irc-calculator select {
    width:100%;
    padding:8px;
}

#irc_calc_btn {
    margin-top:15px;
    padding:10px;
    width:100%;
    font-size:16px;
    font-weight:bold;
}

#irc_result {
    margin-top:15px;
    font-size:18px;
    font-weight:700;
}