eshop changing the text of add card in joomla

hi!!
i have a problem with my project i use joomla 3, i cant find the code in my control panel (the button) of the add card to replace it.. my add card is a simple word and want to coding the code below:
background-color: #ff0000;
border: none;
color: white;
padding: 15px 32px;
text-align: center;
text-decoration: none;
display: inline-block;
font-size: 16px;
margin: 4px 2px;
cursor: pointer;

i want to find my code in style.css but i cant and chanching by code that i wrote

Hi again Giannis,

Please submit a new ticket to EShop category so I can help you to check it.

Sincerely, Giang