.sac-age-calculator {
    max-width: 400px;
    padding: 15px;
    border: 1px solid #ddd;
    border-radius: 8px;
    background: #f9f9f9;
}
.sac-age-calculator h3 {
    margin-bottom: 10px;
}
.sac-age-calculator input, 
.sac-age-calculator button {
    width: 100%;
    padding: 8px;
    margin: 5px 0;
}
#calculate {
    background: #0073aa;
    color: #fff;
    border: none;
    cursor: pointer;
}
#calculate:hover {
    background: #005f8d;
}