Add KA logo

index.html

@@ -43,6 +43,10 @@
       <div class="example tex" data-expr="\displaystyle 1 +  \frac{q^2}{(1-q)}+\frac{q^6}{(1-q)(1-q^2)}+\cdots = \prod_{j=0}^{\infty}\frac{1}{(1-q^{5j+2})(1-q^{5j+3})}, \quad\quad \text{for }\lvert q\rvert<1."></div>
     </div></div>
 
+    <div class="footer"><div class="container">
+      <a class="ka-logo" href="https://www.khanacademy.org/"><img src="khan-academy.png" alt="Khan Academy" width="180" height="17"></a>
+    </div></div>
+
     <script src="lib/katex/katex.min.js" type="text/javascript"></script>
     <script src="main.js" type="text/javascript"></script>
     <script type="text/javascript">

main.css

@@ -8,13 +8,16 @@ body {
     width: 800px;
 }
 
-.header {
+.header, .footer {
     color: #fff;
     background: #329894;
-    padding: 40px 0 0;
     overflow: hidden;
 }
 
+.header {
+    padding: 40px 0 0;
+}
+
 .logo {
     color: #fff;
     font-size: 45px;
@@ -121,3 +124,13 @@ body {
     text-align: center;
     margin: 30px 0;
 }
+
+.footer {
+    padding: 30px 0;
+    font-size: 21px;
+}
+
+.ka-logo img {
+    border: none;
+    vertical-align: -1px;
+}