Merge pull request #16 from w3c/ashimura-patch-2

Update index.html - fix CSS style for images

draft-charter/index.html

@@ -56,7 +56,7 @@
      section {
          clear: both;
      }
-     img {
+     img.diagram {
          margin-top: 0.5em;
          display: block;
          margin-left: auto;
@@ -235,11 +235,11 @@ <h4>W3C Web of Things</h4>
         <p>IoT developers face the big problem of “IoT Silos” when creating an
             application including multiple services from different IoT platforms.</p>
 
-        <img alt="IoT Silos" src="./20181203-iot-silos-e.png" width="40%" style="align: center" />
+        <img class="diagram" alt="IoT Silos" src="./20181203-iot-silos-e.png" width="40%" />
 
         <p>The W3C Web of Things (WoT) Working Group has been working on standards to counter the fragmentation of the IoT and enable easy integration of IoT devices and services across IoT platforms and application domains by providing a common description across different ecosystems (=WoT Thing Description), standards.</p>
 
-         <img alt="Interconnection using WoT" src="./20181203-plugfest-e.png" width="60%" />
+         <img class="diagram" alt="Interconnection using WoT" src="./20181203-plugfest-e.png" width="60%" />
 
          <p>WoT standards are now being used for various industry areas including the following:/p>
          <dl>
@@ -413,7 +413,7 @@ <h2>Scope</h2>
             <li>Verifiable Credentials (VC): standardized description for user credentials</li>
         </ul>
 
-            <img alt="Possible Web-based Digital Twins Platform" src="./wot20.png" width="50%"/>
+            <img class="diagram" alt="Possible Web-based Digital Twins Platform" src="./wot20.png" width="50%"/>
 
             <p>To continue further discussion on the common Web-based platform and standardized vocabulary, we'd like to launch a dedicated group:</p>
             <ul>