Nav, button, breadcrumb fixes

tool/template-learn-overview.html

@@ -78,7 +78,7 @@
         <div class="col-lg-4 order-2 order-lg-1">
           <p>{% trans %}XRP can be sent directly without needing a central intermediary, making it a convenient instrument in bridging two different currencies quickly and efficiently. It is freely exchanged on the open market and used in the real world for enabling cross-border payments and microtransactions.{% endtrans %}</p>
           <p>{% trans %}Unlike Bitcoin, there is a finite amount of XRP. All XRP is already in existence today—100 billion in total.{% endtrans %}</p>
-          <a href="history.html" class="btn btn-clear">{% trans %}History of XRP{% endtrans %}</a>
+          <a href="history.html" class="btn btn-outline-secondary">{% trans %}History of XRP{% endtrans %}</a>
         </div>
       </section>
 
@@ -101,7 +101,7 @@
         </div>
         <div class="col-lg-5 offset-lg-1">
           <h4 class="mb-10">{% trans %}Anyone can operate a validator; currently, over 150 <a href="run-a-rippled-validator.html">validators</a> are active on the ledger, operated by  universities, exchanges, businesses and individuals.{% endtrans %}</h4>
-          <a href="consensus-network.html" class="btn btn-clear">{% trans %}Get Technical{% endtrans %}</a>
+          <a href="consensus-network.html" class="btn btn-outline-secondary">{% trans %}Get Technical{% endtrans %}</a>
         </div>
       </section>
 
@@ -177,7 +177,7 @@
           </div>
         </div>
         <div class="text-center">
-          <a href="uses.html" class="btn btn-clear">{% trans %}Explore Uses{% endtrans %}</a>
+          <a href="uses.html" class="btn btn-outline-secondary">{% trans %}Explore Uses{% endtrans %}</a>
         </div>
       </section>
 
@@ -205,7 +205,7 @@
             <p>{% trans %}XRP is traded on more than 140 markets and <a href="exchanges.html">exchanges</a> worldwide.{% endtrans %}</p>
             <p>{% trans %}XRP’s low transaction fees, reliability and high speed enable traders to use the digital asset as high-speed, cost-efficient and reliable collateral across trading venues—<a href="https://ripple.com/insights/xrp-a-preferred-base-currency-for-arbitrage-trading/" target="_blank">seizing arbitrage opportunities</a>, servicing margin calls and managing general trading inventory in real time.{% endtrans %}</p>
             <p>{% trans %}Because of the properties inherent to XRP and the ecosystem around it, traders worldwide are able to shift collateral, bridge currencies and switch from one crypto into another nearly instantly, across any exchange on the planet.{% endtrans %}</p>
-            <a href="exchanges.html" class="mt-10 btn btn-clear">{% trans %}Find Out More{% endtrans %}</a>
+            <a href="exchanges.html" class="mt-10 btn btn-outline-secondary">{% trans %}Find Out More{% endtrans %}</a>
           </div>
         </div>
       </section>
@@ -219,7 +219,7 @@
           <div class="col-md-5 offset-md-1">
             <h2 class="mb-10">{% trans %}What Is the Relationship Between Ripple and XRP?{% endtrans %}</h2>
             <p>{% trans %}Ripple is a technology company that makes it easier to build a high-performance, global payments business through its platform, RippleNet. XRP is a digital asset independent of this, and is used in Ripple’s On-Demand Liquidity service to facilitate efficient and cost-effective cross-border transactions. In December of 2017, Ripple placed 55 Billion XRP into a cryptographically secured <a href="https://ripple.com/insights/explanation-ripples-xrp-escrow/" target="_blank">escrow</a> account to support stable and healthy <a href="https://ripple.com/xrp/market-performance" target="_blank">XRP markets</a>.{% endtrans %}</p>
-            <a class="mt-10 btn btn-clear" href="https://ripple.com/" target="_blank">{% trans %}Visit Ripple's Website{% endtrans %}</a>
+            <a class="mt-10 btn btn-outline-secondary" href="https://ripple.com/" target="_blank">{% trans %}Visit Ripple's Website{% endtrans %}</a>
           </div>
         </div>
       </section>
@@ -233,7 +233,7 @@
           <div class="col-md-5 order-2 order-md-1">
             <h2 class="mb-10">{% trans %}XRPL.org: For the Community, by the Community{% endtrans %}</h2>
             <p>{% trans %}XRPL.org is a community-driven resource for all things XRP and XRP Ledger (XRPL). If you’d like to suggest additional information around XRP, you can suggest changes here.{% endtrans %}</p>
-            <a href="contribute.html" class="mt-10 btn btn-clear">{% trans %}Suggest Changes{% endtrans %}</a>
+            <a href="contribute.html" class="mt-10 btn btn-outline-secondary">{% trans %}Suggest Changes{% endtrans %}</a>
           </div>
         </div>
       </section>