body {
    font-family: Arial, sans-serif;
    background-color: #000;
    margin: 0;
    padding: 20px;
}
h1 {
    color: rgb(244, 246, 140);
    text-align: center;
    background-color:#222;
    padding: 10px;
    border-radius: 5px;
}
.invoice {
    background-color: #fff;
    padding: 20px;
    margin: 20px 0;
    box-shadow: 0 2px 3px rgba(0, 0, 0, 0.1);
    position: relative;
}
.invoice h2, .invoice h3 {
    margin: 0 0 10px;
}
.invoice p {
    margin: 5px 0;
}
.invoice hr {
    border: 0;
    border-top: 1px solid #eee;
    margin: 20px 0;
}
.invoice .total {
    font-size: 1.2em;
    font-weight: bold;
}
.download-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    background-color: rgb(244, 246, 140);
    color: #111;
    font-weight: bold;
    border: none;
    padding: 10px;
    cursor: pointer;
    border-radius: 5px;
    transition: background-color 0.3s;
}
.download-btn:hover {
    background-color: gold;
}