List of steps to reproduce (step by step, including full links if applicable):

• Navigate to https://de.wikivoyage.org/wiki/Berlin/Mitte
• Hover “+”-symbol in the mapframe

What happens?:
When hovering the “+”-button the CSS-rule of ext.kartographer.style

.mw-kartographer-interactive .leaflet-draw-actions a, .mw-kartographer-interactive .leaflet-bar > a {
  border-bottom-width: 0;
}

is overridden by (https://de.wikivoyage.org/w/extensions/Kartographer/lib/external/mapbox/mapbox.css)

.leaflet-bar a, .leaflet-bar a:hover {
  border-bottom: 1px solid #ddd;
}

which leads to all buttons below the “+”-button being pushed down one pixel.

What should have happened instead?:
No button shoving shall occur.

Software version (if not a Wikimedia wiki), browser information, screenshots, other information, etc.: