reverting

_sass/_base.scss

@@ -87,6 +87,16 @@ a {
     background: rgba(255,255,255,.10);
 }
 
+/* scroll to top */
+#scroll-to-top {
+    display: none;
+    position: fixed; 
+    bottom: 20px; 
+    right: 20px; 
+    z-index: 99;
+    font-size: 40px; 
+}
+
 /* feature include tweaks */
 .feature-alert p:last-of-type { margin-bottom: 0; }
 @media (min-width: 768px) {

_sass/_custom.scss

@@ -1217,7 +1217,6 @@ blockquote {
 
 html {
   overflow-x: hidden;
-  max-width: 100vw;
 }
 
 *,
@@ -1235,8 +1234,12 @@ object {
   height: auto;
 }
 
-main * {
-  max-width: 100%;
+@media (max-width: 768px) {
+  body {
+    overflow-x: hidden;
+    max-width: 100vw;
+    min-width: 0;
+  }
 }
 
 figure {
@@ -1267,7 +1270,6 @@ figure {
    ============================================================================ */
 
 #scroll-to-top {
-  display: none;
   position: fixed;
   bottom: 4.5rem;
   right: 1rem;