I have 4 buttons in which two-button have the same color and size but the other two have different. I can put color and size one by one in each button but I want to use style definition otherwise what is the use of style definition in thingworx 8.5 so please help to resolve the issue.
You can create custom style definitions and assign those to your buttons.
Or you can assign separate CSS classes and create separate CSS styling
Not sure if that is the question you are asking.
how can we assign style definition which i made to the button in thingworx 8.5 that i want to know
Sorry these are now assigned by using the Style Theme
You can create additional Style Themes and assign those
or as mentioned create CSS Classes for your different groups of buttons