Fix footer centering

Author: theory

src/play.css

@@ -346,21 +346,20 @@ label[for=optIndent] {
 
 footer {
   margin: 1rem;
-}
-
-footer > * {
-  margin: 1rem 0;
   display: flex;
-  align-items: center;
+  flex-direction: row;
+  flex-wrap: wrap;
   justify-content: center;
+  align-items: center;
+  text-align: center;
 }
 
-footer > p {
-  white-space: pre-wrap;
+footer > * {
+  width: 100%;
 }
 
 #refs a {
-  margin: 0 .3rem;
+  text-decoration: none;
 }
 
 details[open] {