Add link to mathics-live

Author: rocky

assets/css/main.css

@@ -1,5 +1,21 @@
 @import url(fontawesome-all.min.css);
 
+#mathics_live_banner {
+  display: block;
+  position: absolute;
+  top:0;
+  left: 10px;
+  z-index: 10;
+  padding: 10px 50px 10px 10px;
+  color: #fff;
+  /*background: url('../images/blacktocat.png') #ff9000 no-repeat 95% 50%; */
+  background: #000000;
+  font-weight: 700;
+  box-shadow: 0 0 10px rgba(0,0,0,.5);
+  border-bottom-left-radius: 2px;
+  border-bottom-right-radius: 2px;
+}
+
 #forkme_banner {
   display: block;
   position: absolute;

index.html

@@ -16,6 +16,7 @@
     <!-- Header -->
     <div id="header_wrap" class="outer">
       <header id="header" class="inner">
+	<a id="mathics_live_banner" href="https://mathics3.github.io/Mathics3-live/">Try online</a>
 	<a id="forkme_banner" href="https://github.com/Mathics3">View on GitHub</a>
         <div class="content">
           <h1><img id="logo" src="images/logo-heptatom.svg" alt="Mathics logo" height="50px"/>&nbsp;<a href="#">Mathics3</a></h1>