Translating one word with css

Hi! I hope there is a person, who can help me. I have a theme in wordpress and I have also Loco translate but it´s not helping. I have a word (right: two) that I would need to translate in my own language. I can find the code in html when using Inspect Element in Crome. And can change it there, but I don´t know which part of the code I need to put Css-field. I have done some colour and image changes in css, but this I just can not to by my self. The support of the theme is bad and can not figure this out.