When using the vim-sneak plugin with label mode enabled, the second character is highlighted in the default magenta color. The transition is jarring and it would look better if it was a solid color like the cursor's background. The SneakLabelMask highlight group affects the second character.
I did a small research and turns out miramare doesn't have vim-sneak implemented, so your vim is using the default color, being an eye-rape magenta for some reason, you'll have to do a PR implementing vim-sneak
When using the vim-sneak plugin with label mode enabled, the second character is highlighted in the default magenta color. The transition is jarring and it would look better if it was a solid color like the cursor's background. The SneakLabelMask highlight group affects the second character.