Upgrade to Bootstrap 4.2.1, see https://github.com/twbs/bootstrap/issues/26952 and https://blog.getbootstrap.com/2018/12/21/bootstrap-4-2-1/ for official Bootstrap docs.

Replace the following files/snippets:

• Replace: reference to all Bootstrap 4.2.1 CSS and Javascript files in head & footer.
• Using command line within the /theme folder, run: yarn

Changes:

• New: Added a new spinner loading component.
• New: Added new toast component for displaying notifications.
• New: Added a new iOS style switch (a modifier class to our custom checkboxes).
• New: Added touch support in our carousel component.
• New: Added .font-weight-lighter and .font-weight-bolder utilities.
• New: Added .text-decoration-none utility class.
• New: Added .modal-xl modifier class for our modals.
• New: Added new negative margin utility classes (e.g., .mb-n3). These rad new classes not only allow you more control over your general spacing needs, but also allow you to create responsive grid gutters at each breakpoint.
• New: Validated form fields now have feedback icons on :invalid and :valid fields. Disable them with the $enable-validation-icons boolean Sass variable (defaults to true).
• New: Tooltips/Popovers work with Shadow DOM.
• Updated: Redesigned the custom checkboxes and radios for more obvious states.
• Updated: bootstrap-grid.css now includes our margin and padding utilities for full control of our grid system.
• Updated: Changed auto columns (e.g., .col-auto) from max-width: none to max-width: 100% to prevent content from causing a column to overflow the parent.
• Updated: Improved rendering of custom selects, ranges, file input, and more.