How to Increase a word size

Site URL: https://www.capilla-wine.com/accueil

Hi i want to Increase size only "Boutique en ligne" in my second navigation how can I do? 

32 minutes ago, Haiko said:

Site URL: https://www.capilla-wine.com/accueil

Hi i want to Increase size only "Boutique en ligne" in my second navigation how can I do? 

Is this what you mean

You can add to Home > Design > Custom Css

.Header-nav-inner [href="/sous-catgorie"] {
  font-size: 1.5em;
}

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