Make the search list look better on small screens

templates/book_list.html

@@ -14,13 +14,13 @@
 		  <span class="text-muted">{{if .Publisher}}{{.Publisher}}{{end}}</span>
 		</p>
 		<div class="card-text row">
-		  <p class="col-9">
+		  <p class="col-md-9">
 			{{range $i, $author := .Authors}}
 			  {{if $i}}<span class="text-muted">&amp;</span>{{end}}
 			  {{$author}}</a>
 			{{end}}
 		  </p>
-		  <div class="col-3">
+		  <div class="col-md-3">
 			<div class="btn-group d-flex justify-content-end">
 			  <a href="{{download_url .}}" class="btn btn-dark btn-sm">
 				<svg class="bi" width="1em" height="1em" fill="currentColor">