Newsletter input section font type (change font family, font size)

Hello!

I'd like to change the font type in the input section (where it automatically says Email Address, First Name etc) to a different one, to match the rest of my website (Open Sans or Avenir).

Also: how to change the newsletter text beneath the header font.

And how to change the size of the Newsletter Header just for mobile (right now it looks very small).

Any ideas how to do that?

The website is www.onebreath.eu.

Thank you!

@myrto Where is newsletter input?

@tuanphan: https://www.onebreath.eu/welcomehttps://www.onebreath.eu/connect

@myrto First Name, Last Name, Email...has been already Open Sans, you want to change...?

"change the newsletter text beneath the header font." below Our Community or below fields?

Finally, change the size of the Newsletter Header. Add to Home > Design > Custom CSS

@media screen and (max-width:640px) {
/* Join out community font size */
h2.newsletter-form-header-title {
   font-size: 20px !important;
}
/* Description */
.newsletter-form-header-description p {
   font-size: 20px !important;
}
}