Fix issue 1780 by switching card-block to card-body.

evennia/web/website/templates/website/404.html

@@ -10,7 +10,7 @@
 <div class="row">
   <div class="col">
     <div class="card">
-      <div class="card-block">
+      <div class="card-body">
         <h1 class="card-title">Error 404</h1>
         <h4 class="card-subtitle">Page not found</h2>
         <hr />

evennia/web/website/templates/website/500.html

@@ -10,7 +10,7 @@
 <div class="row">
   <div class="col">
     <div class="card">
-      <div class="card-block">
+      <div class="card-body">
         <h1 class="card-title">Error 500</h1>
         <h4 class="card-subtitle">Internal Server Error</h2>
         <hr />

evennia/web/website/templates/website/evennia_admin.html

@@ -6,7 +6,7 @@
 <div class="row">
   <div class="col">
     <div class="card">
-      <div class="card-block">
+      <div class="card-body">
         <h1 class="card-title">Admin</h1>
         <p class="card-text">
           Welcome to the Evennia Admin Page. Here, you can edit many facets of accounts, characters, and other parts of the game.

evennia/web/website/templates/website/flatpages/default.html

@@ -7,7 +7,7 @@
 <div class="row">
   <div class="col">
     <div class="card">
-      <div class="card-block">
+      <div class="card-body">
         <h1 class="card-title">{{flatpage.title}}</h1>
         {{flatpage.content}}
       </div>

evennia/web/website/templates/website/tbi.html

@@ -12,7 +12,7 @@
     <div class="col">
         <div class="card text-center">
             <h1 class="card-header">To Be Implemented...</h1>
-            <div class="card-block">
+            <div class="card-body">
                 This feature has yet to be implemented, but rest assured that it will be!
                   <br />
                   <br />