Mine

bool DRAWING::CursorOnButton( float CursorX, float CursorY, float x, float y, float width, float height )
{
	if( ( CursorX >= x )  && ( CursorX <= ( x + width ) )  &&  ( CursorY >= y )  &&  ( CursorY <= ( y + height ) ) )
		return true;
	else
		return false;
}

if( Draw.CursorOnButton( CursorX, CursorY, 373, 148, 14, 14 )  &&  GetAsyncKeyState( VK_LBUTTON ) & 1 )
{
	M.VecX--;

	Draw.DrawRectColor( 373, 148, 14, 14, 7, 0.3f, 0.3f, 0.3f, 1 );
	Draw.DrawRectColor( 373, 148, 14, 1, 0.5f, 0.5f, 0.5f, 0.5f, 1 );
	Draw.DrawRectColor( 373, 148, 1, 14, 7, 0.5f, 0.5f, 0.5f, 1 );
	Draw.DrawRectColor( 373, 162, 15, 1, 0.5f, 0, 0, 0, 1 );
	Draw.DrawRectColor( 387, 148, 1, 14, 7, 0, 0, 0, 1 );

	if( M.VecX < -20 ){ M.VecX = -20; }
}