body {
    font-family: sans-serif;
    background-color: #f0f2f5;
    margin: 0;
    padding: 20px;
}

form {
    max-width: 500px;
    margin: 0 auto;
}

section {
    background-color: white;
    border: 1px solid #ccc;
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
}

#sender_details {
    background-color: #e8f0fe;
}

#recipient_details {
    background-color: #e8f0fe;
}

#payment_details {
    background-color: #e8f0fe;
}

h2 {
    margin-top: 0;
}

label {
    display: block;
    margin-top: 12px;
    margin-bottom: 4px;
}

input, select, textarea {
    width: 100%;
    padding: 8px;
    border: 1px solid #aaa;
    border-radius: 6px;
    box-sizing: border-box;
}

input[type="radio"],
input[type="checkbox"] {
    width: auto;
}

#notify_recipient label {
    display: inline;
}

#preview img {
    max-width: 100%;
    border-radius: 12px;
}

button {
    width: 100%;
    padding: 12px;
    background-color: #1a73e8;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    cursor: pointer;
}