make card layout go 1-wide in medium breakpoint
make card layout go 1-wide in medium breakpoint

- i.e. use the 3-card-wide layout in the large breakpoint only
- this resolve the issue of overflowing text under the medium
  breakpoint

etpinard/etpinard.github.io,etpinard/etpinard.github.io,etpinard/etpinard.github.io