Add error message and change styles

[codecov[bot]]

Codecov Report

Merging #53 into master will decrease coverage by 0.14%. The diff coverage is 11.11%.

@@            Coverage Diff             @@
##           master      #53      +/-   ##
==========================================
- Coverage   23.09%   22.95%   -0.15%     
==========================================
  Files          41       41              
  Lines         433      440       +7     
  Branches       58       61       +3     
==========================================
+ Hits          100      101       +1     
- Misses        307      312       +5     
- Partials       26       27       +1     

Impacted Files	Coverage Δ
...ts/pages/Practice/CustomPractice/customPractice.js	4.76% <0.00%> (-0.65%)	:arrow_down:
src/components/viewDecks/viewDeck-style.js	100.00% <ø> (ø)
src/components/viewDecks/viewDecks.js	11.76% <0.00%> (-0.74%)	:arrow_down:
...es/Practice/CustomPractice/customPractice-style.js	100.00% <100.00%> (ø)

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[Ivo-Evans]

Looks good!