.pimcore_material_icon_chat {
    filter: invert(100%);
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" height="1em" viewBox="0 0 512 512"><path d="M256 32C114.6 32 0 125.1 0 240c0 49.6 21.4 95 57 130.7C44.5 421.1 2.7 466 2.2 466.5c-2.2 2.3-2.8 5.7-1.5 8.7S4.8 480 8 480c66.3 0 116-31.8 140.6-51.4 32.7 12.3 69 19.4 107.4 19.4 141.4 0 256-93.1 256-208S397.4 32 256 32zM128 272c-17.7 0-32-14.3-32-32s14.3-32 32-32 32 14.3 32 32-14.3 32-32 32zm128 0c-17.7 0-32-14.3-32-32s14.3-32 32-32 32 14.3 32 32-14.3 32-32 32zm128 0c-17.7 0-32-14.3-32-32s14.3-32 32-32 32 14.3 32 32-14.3 32-32 32z"/></svg>') center center no-repeat;
}

.pimcore_main_toolbar + .x-panel > .x-panel-bodyWrap > .x-tab-bar-default .x-tab.x-tab-active .pimcore_material_icon.pimcore_material_icon_chat {
    filter: invert(0);
}