fix(web-client): Fix phone input colors.

[IscoRuta98]

Aim of this PR is to address the following issue: Unable to read input text on country code form

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[codecov-commenter]

Codecov Report

Merging #610 (b24b3d8) into main (08f1224) will not change coverage.
The diff coverage is n/a.

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@@           Coverage Diff           @@
##             main     #610   +/-   ##
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  Coverage   42.52%   42.52%           
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  Files         201      201           
  Lines        3487     3487           
  Branches      685      685           
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  Hits         1483     1483           
  Misses       2004     2004           

[billguo99]

LGTM