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* Refer mx_MessageActionBar on pinned messages card Normalize mx_MessageActionBar style rules - Allow the varaible (--MessageActionBar-size-button) to be used - Remove redundant declarations Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com> * Use variables for normalization Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com> * Set class name Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com> * Readd the comment Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com> * Use Heading size='h4' - Use size='h4' instead of 'h2' as 15px has been specified as the font-size of the header - Use logical values following _Heading.scss - Remove line-height declaration in favor of the default value Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>