.popup-desconto {
    position: fixed;
    border-radius: 10px;
    bottom: 10%;
    right: 1%;
    box-shadow: 4px 4px 10px rgba(0, 0, 0, 0.5);
    display: inline;
    height: 300px;
}

.popup-desconto img {
    max-width: 300px;
    height: auto;
    border-radius: inherit;
}

.popup-desconto button {
    position: absolute;
    top: 10px;
    right: 10px;
    background-color: transparent;
    border: none;
    cursor: pointer;
    font-size: 1em;
}

@media (max-width: 500px) {
    .popup-desconto {
        bottom: 400px;
        right: 50px;
    }
}