Use dynamic content class on mission page

app/views/mission/index.html.erb

@@ -4,7 +4,7 @@
 <section class="bg-image choir"> </section>
 
 <section class="row my-5 justify-content-center">
-  <div class="col col-sm-10 col-md-8 col-lg-7 col-xl-5">
+  <div class="dynamic-content">
     <article class="my-5">
       <h2 class="color-primary">Mission</h2>
       <p class="py-3">The Education Commonwealth Project works to challenge and expand the way student learning and school quality are assessed, advancing an approach to measurement and accountability that is valid, democratic, and equitable. ECP supports schools and communities with free and open-source tools, and broadly seeks to foster state- and national-level change.</p>
@@ -17,16 +17,19 @@
 </section>
 
 <section class="row justify-content-center">
-  <div class="col col-sm-10 col-md-8 col-lg-7 col-xl-5">
+  <div class="dynamic-content">
     <%= image_tag "mission/partnership.svg" , style: "width:100%;" %>
   </div>
 </section>
 
 
 <section class="row justify-content-center">
-  <div class="col col-sm-10 col-md-8 col-lg-7 col-xl-5">
+  <div class="dynamic-content">
     <h2 class="color-primary">Looking For More Information?</h2>
     <p> <%= link_to "Download the ECP Fact Sheet", "/"  %> </p>
     <p> <%= link_to "Download the ECP Frequently Asked Questions", "/"  %> </p>
   </div>
 </section>
+
+<section class="bg-secondary band my-5">
+</section>