add back_links
back_links buttons: add .btn-lg class
remove initial-scale=1.0 in meta viewport
try another viewport meta to prevent scaling
initial-scale = 1,
onFocus="window.scrollTo(0, 0);"
fix bug in footer
homepage => home
update social button styles
sorting-visualization controller: remove { z-index: 1000 }
Merge branch 'bugfix.ui' into dev
fix bug of z-index
lean code style
finish basic function of calculator