.dob-age-calculator {
    padding: 1em;
    border: 1px solid #ccc;
    border-radius: 8px;
    max-width: 400px;
}

.dob-age-calculator input,
.dob-age-calculator button {
    display: block;
    width: 100%;
    margin: 0.5em 0;
    padding: 0.5em;
    font-size: 1em;
}

#copy-age {
    background: transparent;
    border: none;
    cursor: pointer;
    font-size: 1.2em;
    margin-left: 10px;
}