.donation-box{
    max-width:400px;
    margin:auto;
    background:#fff;
    padding:25px;
    border-radius:12px;
    box-shadow:0 0 15px rgba(0,0,0,0.1);
}

.donation-box h2{
    text-align:center;
    margin-bottom:20px;
}

#donation_amount{
    width:100%;
    padding:14px;
    font-size:18px;
    margin-bottom:20px;
}