.top-bar {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 10px;
    z-index: 9999;
}

.top-bar button {
    background: none;
    border: none;
    color: #fff;
    cursor: pointer;
    margin-left: 10px;
}