Mobile navigation: Large fonts

Example:

Code:

/* -- code to use large fonts in mobile navigation -- */
.nav--mobile .accessibleNav li a.nav-link {
  font-size: 28px;
  line-height: 36px;
  font-weight: 100;
  text-transform: capitalize;
  padding-top: 5px;
  padding-bottom: 10px;
}
.nav--mobile .accessibleNav li{
  border-bottom: none; 
}
/* - end - */

Where do I add the code?

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Where to add your CSS style code