* enable to scroll the setting's page sidebar
add scroll:auto and use margin instead of padding for the bottom
* Update admin.scss
* Update admin.scss
* Update admin.scss
* Remove overflow because it blocks scrolling on mobile safari.
* Add “-webkit-overflow-scrolling: touch;” to enable smooth scroll on mobile safari and other webkit browsers.
* Use radio buttons in user setting page.
Because select tags with long text are not fit in the width of mobile devices.
* Add flex property to fit labels to devise width.
* Change font size of select.
It causes auto zooming on mobile safari.
