Add basic column view

sass/chordpro.scss

@@ -3,6 +3,9 @@
 $col-white: #fff;
 $col-black: #2e3440;
 
+* {
+	box-sizing: border-box;
+}
 
 body {
 	margin: 0;
@@ -22,6 +25,18 @@ table {
 	padding: 3em 0 1em 1em;
 }
 
+html.column-view .song {
+	column-width: 15em;
+  column-gap: 6em;
+	column-fill: auto;
+	max-height: 100vh;
+	overflow: visible;
+
+	table, .verse, .chorus, .tab, .comment {
+		break-inside: avoid;
+	}
+}
+
 .title {
 	font-size: 1.5em;
 	font-weight: bold;