.banner {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    color: white;
    text-align: center;
    padding: 15px;
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}

.banner img {
    max-width: 80%;
    max-height: 80vh;
    height: auto;
    margin: 20px 0;
}

.close-btn {
    font-size: 30px;
    cursor: pointer;
    position: absolute;
    top: 10px;
    right: 20px;
    color: white;
    background-color: transparent;
    border: none;
}