How do I show GitBook title?

Question

In GitBook, the title shows up while mousing over them by default.

I wanna show up the title. I inspect the elements,

<div class="book-header" role="navigation">
    <!-- Title -->
    <h1>
        <i class="fa fa-circle-o-notch fa-spin"></i>
        <a href=".." >Preface</a>
    </h1>
</div>

and related CSS is,

.book-header h1 a, .book-header h1 a:hover {
    color: inherit;
    text-decoration: none;
}

I add the following CSS,

.book-header h1 a {
    display: block !important;
}

but it doesn't work.

---

Update:

I follow the answer from @ED Wu, and add the following code to CSS,

.book-header h1 {
    opacity: 1;
}

The title does show up. However, the left sidebar doesn't show up while I click on 三 (no action) after adding opacity:1. An example is here.

Answer 1

Because .book-header h1 opacity is 0.

Try add this to your css.

.book-header h1 {
   opacity:1!important;
}