[microsite] tweaking CNCF logo styling (#2529)

microsite/pages/en/index.js

@@ -471,8 +471,8 @@ class Index extends React.Component {
                 Cloud Native Computing Foundation
               </a>{' '}
               sandbox project
+              <div className="cncf-logo" />
             </Block.SmallTitle>
-            <div className="cncf-logo" />
           </Block.Container>
         </Block>
       </main>

microsite/static/css/custom.css

@@ -1072,6 +1072,7 @@ code {
 }
 
 .cncf-block {
+  padding-top: 40px;
   text-align: center;
 }
 
@@ -1080,4 +1081,5 @@ code {
   width: 100%;
   height: 100px;
   margin-bottom: 40px;
+  margin-top: 20px;
 }