You need to state which Story Format you are using when you ask a question, as answers can be different for each one. I am going to assume you are using Harlowe.
You can change the opacity of the Undo/Redo links by placing the following CSS selectors within your Story Stylesheet area and then increase the opacity value. (range is 0 to 1)
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You can change the opacity of the Undo/Redo links by placing the following CSS selectors within your Story Stylesheet area and then increase the opacity value. (range is 0 to 1)