Fix typo: s/sponser/sponsor/ and tweak code layout in the section

Author: yasulab

app/assets/stylesheets/custom.scss

@@ -37,7 +37,7 @@ div #README{
 .snsb iframe {
     margin: 0 !important;
 }
-.sponsers_logo {
+.sponsors_logo {
     ul{
         padding: 0;
         margin: 0;
@@ -66,14 +66,14 @@ div #README{
 }
 
 @media only screen and (max-width:720px) {
-    .sponsers_logo{
+    .sponsors_logo{
         li{
             width: 46%;
         }
     }
 }
 @media only screen and (max-width:560px) {
-    .sponsers_logo{
+    .sponsors_logo{
         li{
             width: 90%;
         }

app/views/custom_widget/show.html.erb

@@ -109,32 +109,21 @@
     <p>「これまでの成り立ちを知りたい」「地元で道場を立ち上げてみたい」といった場合には <a href="/kata">CoderDojo Kata</a> を参照してみてください。</p>
   </section>
 </div>
-<div >
-    <section class='detail-introduction sponsers_logo text-center'>
-        <h2>スポンサー</h2>
-        <ul>
-          <li>
-            <a href="https://case-shinjuku.com/">
-              <%= image_tag "case-shinjuku_logo.png"%>
-            </a>
-          </li>
-          <li>
-            <a href="http://www.osscafe.net/ja/">
-              <%= image_tag "osscafe_logo.png"%>
-            </a>
-          </li>
-          <li>
-            <a href="https://scrivito.com/">
-              <%= image_tag "scrivito_logo.png"%>
-            </a>
-          </li>
-           <li>
-             <a href="https://yasslab.jp/">
-               <%= image_tag "yasslab_logo.png"%>
-             </a>
-           </li>
-        </ul>
-    </section>
+
+<div>
+  <section class='detail-introduction sponsors_logo text-center'>
+    <h2>スポンサー</h2>
+    <ul>
+      <li><a href="https://case-shinjuku.com/">
+          <%= image_tag "case-shinjuku_logo.png"%></a></li>
+      <li><a href="http://www.osscafe.net/ja/">
+          <%= image_tag "osscafe_logo.png"%></a></li>
+      <li><a href="https://scrivito.com/">
+	  <%= image_tag "scrivito_logo.png"%></a></li>
+      <li><a href="https://yasslab.jp/">
+          <%= image_tag "yasslab_logo.png"%></a></li>
+    </ul>
+  </section>
 </div>
 <div class="text-center grayscale-bg">
    <section class='detail-introduction'>