Add css styling for book-nav components

[dualcnhq]

[codecov[bot]]

Codecov Report

Merging #653 (69023dc) into master-v5 (294bfef) will increase coverage by 4.16%. The diff coverage is 76.54%.

@@              Coverage Diff              @@
##           master-v5     #653      +/-   ##
=============================================
+ Coverage      62.48%   66.65%   +4.16%     
=============================================
  Files             33       35       +2     
  Lines           3703     3860     +157     
  Branches         701      742      +41     
=============================================
+ Hits            2314     2573     +259     
+ Misses          1121     1029      -92     
+ Partials         268      258      -10     

Impacted Files	Coverage Δ
src/js/BookReader/Toolbar/Toolbar.js	69.30% <ø> (+0.99%)	:arrow_up:
src/js/BookReader/options.js	100.00% <ø> (ø)
src/js/plugins/plugin.autoplay.js	72.22% <0.00%> (ø)
src/js/plugins/plugin.mobile_nav.js	69.41% <ø> (ø)
src/js/plugins/search/plugin.search.js	56.79% <0.00%> (+2.75%)	:arrow_up:
src/js/plugins/plugin.text_selection.js	70.58% <50.00%> (-3.75%)	:arrow_down:
src/js/BookReader/Mode1Up.js	68.14% <68.14%> (ø)
src/js/BookReader/Navbar/Navbar.js	84.76% <78.12%> (-4.53%)	:arrow_down:
src/js/BookReader/Mode2Up.js	56.19% <78.16%> (+6.77%)	:arrow_up:
src/js/BookReader.js	69.73% <89.58%> (+2.19%)	:arrow_up:
... and 14 more

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