#frame-header {
    position: fixed;
    top: 0;
    right: 0;
    left: 0;
    border-bottom: 1px solid rgba(0, 0, 0, .175);
    background-color: rgba(0, 0, 0, .02);
    transition: background-color 200ms;
    overflow: auto;
    padding: 10px;
    display: flex;
    align-items: center;
    height: 24px;
    font-size: 20px;
    font-weight: 600;
}

#frame-header:hover {
    background-color: rgba(0, 0, 0, .03);
}