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* Allow setting an additional alpha on a border See #1863. * Update the ChangeLog * Add snapshot tests for the border alpha value * Extend the border snapshot tests While this doesn't test *every* permutation, it covers enough bases that if something were to change it should catch it. * Tweak a typo in the border style examples * Add border transparency percentage to the border docs * Add a CSS example for using border transparency * Add Color.multiply_alpha * Update the CHANGELOG * Multiply the alpha on a colour rather than replace it As requested in https://github.com/Textualize/textual/pull/1954#pullrequestreview-1328170386 (actually required while talking in person with Will, but noted in the above) * Multiply the alpha on a border colour rather than replace it As requested in https://github.com/Textualize/textual/pull/1954#pullrequestreview-1328170386 (actually requested while talking in person with Will, but noted in the above)