How to change title elements

The style of title element is found in app/style/scss/elements/_titleBlock.scss

These additional classes are added to each HTML as per example:

<div class="title-block title-block--center">
   <h4 class="title-block__subtitle txt-dark-transparent">THOUGHTS</h4>
   <h2 class="title-block__title txt-dark">What they're saying</h2>
 </div>