Buttons css names list of them all

I am using html button setting becuase I want to use my own image, but I cant find the name for the different buttons.

I have the button for the product page add to cart button, but is it possible to get them all during the progress.
Like next, proceed to checkout etc. (if there are others)

I use this code to show the image button on the product page.

.hikashop_product_quantity_main .button{
background: white url(' www.obeeva.com/images/stories/thebelcherbutton2.png ') no-repeat top;
width: 300px;
height: 149px;
}

yes it's possible. The class button is used for all the buttons on the front end:
.button{
your CSS here
}

If I want to use different images for each button, is there a different name for next button and proceed to checkout?
So i can replace the buttons with different images.

Sure. That's what we do on our demo website. You can just look at the CSS on our demo website using Firebug to see how we did it.

How do I change or remove the 'add to cart' text?

Any text in HikaShop can be changed by overriding the translation file:
www.hikashop.com/en/download/languages.html#modify

great!