:root{
    --mau-md: #006241;
}

.layout-book-header{
    height: 50px;
    background: transparent;
    position: fixed;
    width: 100%;
    top: 0;
    left: 0;
    padding: 0px 10px;
}

.layout-book-header #back-book{
    padding: 6px 16px;
    background: var(--mau-md);
    border-radius: 8px;
}