html - Apply input.button CSS on a submit button without changing CSS? -

i have ton of system generated css rules apply input.button. structure this:

input.button {     /* css properties here */ } 

i have form submit button, defined this:

<input id="submitbtn" type="submit" value="subscribe" /> 

i want apply input.button css on submitbtn too, without having manually modify original css (to apply submitbtn), or manually duplicating css rules input.button submitbtn

so there way directly utilize css meant input.button, , apply submit button, without changing/adding/modifying/deleting css code ?

if can change in css change

input[type=submit] 

if can change in button change

<input id="submitbtn" type="submit" class="button" value="subscribe" />