The Arial typeface does not offer a font weight option between normal (400) and bold (700), unlike some other fonts available. In this case, it may be beneficial to select a different font that provides either an intermediate weight or a suitable bold typeface that meets your requirements and preferences.
For instance, Google fonts like Source Sans Pro and Open Sans are similar to Arial and offer a semi-bold (600) typeface option.
While it is possible to mimic bold text using CSS text shadowing with the same color as the text itself, for example: text-shadow: 1px 0 black
, the outcome generally lacks the authenticity of genuine bolding. Artificially thickening strokes through text shadowing does not replicate true bold font characteristics effectively.