Выглядит это примерно так.
Код:
_style.Colors[ImGuiCol_Text] = ImVec4(0.90f, 0.90f, 0.90f, 1.00f);
_style.Colors[ImGuiCol_TextDisabled] = ImVec4(0.60f, 0.60f, 0.60f, 1.00f);
_style.Colors[ImGuiCol_TextSelectedBg] = ImVec4(0.00f, 0.00f, 1.00f, 0.35f);
_style.Colors[ImGuiCol_WindowBg] = ImVec4(0.10f, 0.16f, 0.10f, 0.80f);
_style.Colors[ImGuiCol_ChildWindowBg] = ImVec4(0.10f, 0.10f, 0.10f, 0.00f);
_style.Colors[ImGuiCol_PopupBg] = ImVec4(0.05f, 0.05f, 0.10f, 0.90f);
_style.Colors[ImGuiCol_Border] = ImVec4(0.70f, 0.70f, 0.70f, 0.65f);
_style.Colors[ImGuiCol_BorderShadow] = ImVec4(0.00f, 0.00f, 0.00f, 0.00f);
_style.Colors[ImGuiCol_FrameBg] = ImVec4(0.30f, 0.36f, 0.70f, 1.00f);
_style.Colors[ImGuiCol_FrameBgHovered] = ImVec4(0.90f, 0.80f, 0.80f, 0.40f);
_style.Colors[ImGuiCol_FrameBgActive] = ImVec4(0.90f, 0.65f, 0.65f, 0.45f);
_style.Colors[ImGuiCol_TitleBg] = ImVec4(0.14f, 0.14f, 0.16f, 1.0f);
_style.Colors[ImGuiCol_TitleBgCollapsed] = ImVec4(0.14f, 0.14f, 0.16f, 1.0f);
_style.Colors[ImGuiCol_TitleBgActive] = ImVec4(0.14f, 0.14f, 0.16f, 1.0f);
_style.Colors[ImGuiCol_TitleText] = ImVec4(1.00f, 1.00f, 1.00f, 1.00f);
_style.Colors[ImGuiCol_MenuBarBg] = ImVec4(0.40f, 0.40f, 0.55f, 0.80f);
_style.Colors[ImGuiCol_ScrollbarBg] = ImVec4(0.20f, 0.25f, 0.30f, 0.60f);
_style.Colors[ImGuiCol_ScrollbarGrab] = ImVec4(0.40f, 0.40f, 0.80f, 0.30f);
_style.Colors[ImGuiCol_ScrollbarGrabHovered] = ImVec4(0.40f, 0.40f, 0.80f, 0.40f);
_style.Colors[ImGuiCol_ScrollbarGrabActive] = ImVec4(0.80f, 0.50f, 0.50f, 0.40f);
_style.Colors[ImGuiCol_ComboBg] = ImVec4(0.10f, 0.10f, 0.12f, 1.0f);
_style.Colors[ImGuiCol_CheckMark] = ImVec4(0.00f, 0.60f, 0.90f, 0.50f);
_style.Colors[ImGuiCol_SliderGrab] = ImVec4(1.00f, 1.00f, 1.00f, 0.30f);
_style.Colors[ImGuiCol_SliderGrabActive] = ImVec4(0.80f, 0.50f, 0.50f, 1.00f);
_style.Colors[ImGuiCol_Button] = ImVec4(0.19f, 0.19f, 0.21f, 0.75f);
_style.Colors[ImGuiCol_ButtonHovered] = ImVec4(0.22f, 0.21f, 0.23f, 0.75f);
_style.Colors[ImGuiCol_ButtonActive] = ImVec4(0.80f, 0.26f, 0.17f, 0.90f);
_style.Colors[ImGuiCol_Header] = ImVec4(0.40f, 0.46f, 0.75f, 0.45f);
_style.Colors[ImGuiCol_HeaderHovered] = ImVec4(0.40f, 0.46f, 0.70f, 0.80f);
_style.Colors[ImGuiCol_HeaderActive] = ImVec4(0.40f, 0.46f, 0.65f, 0.80f);
_style.Colors[ImGuiCol_Column] = ImVec4(0.50f, 0.50f, 0.50f, 1.00f);
_style.Colors[ImGuiCol_ColumnHovered] = ImVec4(0.70f, 0.60f, 0.60f, 1.00f);
_style.Colors[ImGuiCol_ColumnActive] = ImVec4(0.90f, 0.70f, 0.70f, 1.00f);
_style.Colors[ImGuiCol_ResizeGrip] = ImVec4(1.00f, 1.00f, 1.00f, 0.30f);
_style.Colors[ImGuiCol_ResizeGripHovered] = ImVec4(1.00f, 1.00f, 1.00f, 0.60f);
_style.Colors[ImGuiCol_ResizeGripActive] = ImVec4(1.00f, 1.00f, 1.00f, 0.90f);
_style.Colors[ImGuiCol_CloseButton] = ImVec4(0.40f, 0.40f, 0.40f, 0.50f);
_style.Colors[ImGuiCol_CloseButtonHovered] = ImVec4(0.70f, 0.30f, 0.30f, 1.00f);
_style.Colors[ImGuiCol_CloseButtonActive] = ImVec4(1.00f, 0.50f, 0.30f, 0.83f);
_style.Colors[ImGuiCol_PlotLines] = ImVec4(1.00f, 1.00f, 1.00f, 1.00f);
_style.Colors[ImGuiCol_PlotLinesHovered] = ImVec4(0.90f, 0.70f, 0.00f, 1.00f);
_style.Colors[ImGuiCol_PlotHistogram] = ImVec4(0.90f, 0.70f, 0.00f, 1.00f);
_style.Colors[ImGuiCol_PlotHistogramHovered] = ImVec4(1.00f, 0.60f, 0.00f, 1.00f);
_style.Colors[ImGuiCol_ModalWindowDarkening] = ImVec4(0.20f, 0.20f, 0.20f, 0.35f);
_style.Colors[ImGuiCol_MainWindow] = ImVec4(0.14f, 0.14f, 0.16f, 1.0f);