#close-banner {
    background: none;
    border: none;
    color: inherit;
    font-size: 1.2em;
    cursor: pointer;
    padding: 0 5px;
    border-radius: 3px;
    transition: background-color 0.2s ease;
    position: absolute;
    top: 8px;
    right: 12px;
}