Message: hide icon cell on mobile

src/main/sass/spring/_asciidoctor.scss

@@ -31,7 +31,6 @@ body {
   line-height: 1;
   position: relative;
   cursor: auto;
-  border-top: 3px solid $spring-primary-color;
 }
 
 a:hover {

src/main/sass/spring/_layout.scss

@@ -44,6 +44,7 @@ div.back-action, #toc.toc2 div.back-action {
   margin: 0 1rem;
   padding: 0 1rem;
   border-bottom: 1px solid #ddddd8;
+  border-top: 3px solid $spring-primary-color;
   h1 {
     margin: 0;
     padding: 0;

src/main/sass/spring/_responsive.scss

@@ -3,6 +3,15 @@
   display: none;
 }
 
+.admonitionblock td.icon {
+  display: none;
+}
+
+.admonitionblock>table td.content {
+  padding-left: 1.25em;
+}
+
+
 @media only screen and (min-width: 768px) {
   $w: 15em;
   #toctitle {
@@ -23,6 +32,15 @@
   .literalblock pre, .literalblock pre[class], .listingblock pre, .listingblock pre[class] {
     font-size: 0.90625em;
   }
+
+  .admonitionblock td.icon {
+    display: table-cell;
+  }
+
+  .admonitionblock>table td.content {
+    padding-left: 0;
+  }
+
   body.toc2 {
     padding-right: 0;
     //padding-left: 15em;