Make the maximum page width slightly bigger

_static/css/custom.css

@@ -541,6 +541,7 @@ footer,
 
 .wy-nav-content {
     background-color: var(--content-background-color);
+    max-width: 900px;
 }
 
 .wy-body-for-nav {
@@ -550,7 +551,7 @@ footer,
 @media only screen and (min-width: 769px) {
     .wy-body-for-nav {
         /* Center the page on wide displays for better readability */
-        max-width: 1100px;
+        max-width: 1200px;
         margin: 0 auto;
     }
 }