font tunin" #7 /\/\/\/

echo.css

@@ -1,18 +1,50 @@
+:focus {
+  outline: thick dotted;
+}
+
+:any-link:hover { 
+  text-decoration-style: double;
+}
+
+* { box-sizing: border-box }
+a { touch-action: manipulation }
+
 html {
   font-family: sans-serif;
   font-size: max(20px, 2vw + 1vh + 1pt);
   line-height: 1.618;
 }
 
-body { margin: 0; padding: 1.618em }
-h1 { font-size: 1.618em; margin: 0 }
-em { font-size: 1.236em; font-style: unset }
-:focus { outline: thick dotted }
-:any-link:hover { text-decoration-style: double }
+body {
+  margin: 0;
+  overflow-wrap: anywhere;
+  padding: 1.618em;
+}
+
+h1 {
+  font-size: 1.618em;
+  margin: 0;
+}
+
+main {
+  contain: layout;
+  display: flow-root;
+}
+
+em,
+b {
+  font: unset;
+  font-size: 1.236em;
+}
+
+p {
+  contain: layout;
+  margin-block: 1em;
+}
 
 kbd {
+  all: unset;
   display: inline-block;
-  font: unset;
   font-size: 2em;
   margin-block: 2em;
   padding-block: 1em;