MediaWiki:Vector.css

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/* Change hamburger (menu toggle) icon color */
.vector-menu-toggle .vector-icon,
.vector-menu-toggle::before {
    fill: #0d47a1 !important;  /* Deep blue icon */
    color: #0d47a1 !important; /* fallback */
}

/* Optional: change color on hover */
.vector-menu-toggle:hover .vector-icon,
.vector-menu-toggle:hover::before {
    fill: #1565c0 !important;  /* Lighter blue */
    color: #1565c0 !important;
}