MediaWiki:Vector.css

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/* Force black color on the sidebar toggle (main menu) icon */
#vector-main-menu-dropdown-label svg {
    color: black !important;
    fill: black !important;
    stroke: black !important;
}

/* Optional: Fix icon button background to be transparent */
#vector-main-menu-dropdown-label {
    background-color: transparent !important;
    border: none !important;
}

/* Optional: On hover and focus, keep icon black */
#vector-main-menu-dropdown-label:hover svg,
#vector-main-menu-dropdown-label:focus svg {
    fill: black !important;
    stroke: black !important;
}