MediaWiki:Vector.css

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/* Style the main menu button (hamburger) */
.vector-main-menu-landmark button {
  background-color: transparent !important;
  color: black !important;
  fill: black !important;
  border: none;
}

/* If it's using ::before or svg icon */
.vector-main-menu-landmark button::before {
  content: "☰"; /* Fallback if icon is broken */
  color: black !important;
  font-size: 20px;
  padding: 5px;
}