Nuklear
This is a minimal-state, immediate-mode graphical user interface toolkit written in ANSI C and licensed under public domain. It was designed as a simple embeddable user interface for application and does not have any dependencies, a default render backend or OS window/input handling but instead provides a highly modular, library-based approach, with simple input state for input and draw commands describing primitive shapes as output. So instead of providing a layered library that tries to abstract over a number of platform and render backends, it focuses only on the actual UI.
 
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Stack

Stack

The style modifier stack can be used to temporarily change a property inside nk_style. For example if you want a special red button you can temporarily push the old button color onto a stack draw the button with a red color and then you just pop the old color back from the stack: 

nk_style_push_style_item(ctx, &ctx->style.button.normal, nk_style_item_color(nk_rgb(255,0,0)));
nk_style_push_style_item(ctx, &ctx->style.button.hover, nk_style_item_color(nk_rgb(255,0,0)));
nk_style_push_style_item(ctx, &ctx->style.button.active, nk_style_item_color(nk_rgb(255,0,0)));
nk_style_push_vec2(ctx, &cx->style.button.padding, nk_vec2(2,2));

nk_button(...);

nk_style_pop_style_item(ctx);
nk_style_pop_style_item(ctx);
nk_style_pop_style_item(ctx);
nk_style_pop_vec2(ctx);

Nuklear has a stack for style_items, float properties, vector properties, flags, colors, fonts and for button_behavior. Each has it's own fixed size stack which can be changed at compile time.