fix #3652 "about" link in "reading view" (#3877)

* fix
* improve nav slider width in mobile view

p/themes/base-theme/template.css

@@ -1324,10 +1324,12 @@ input:checked + .slide-container .properties {
 
 .reader .aside {
 	width: 0;
+	display: none;
 }
 
 .reader .aside:target {
 	width: 300px;
+	display: table-cell;
 }
 
 .reader .aside .stick {
@@ -1389,7 +1391,8 @@ input:checked + .slide-container .properties {
 		z-index: 100;
 	}
 
-	.aside:target {
+	.aside:target,
+	.reader .aside:target {
 		width: 90%;
 		height: 100vh;
 	}

p/themes/base-theme/template.rtl.css

@@ -1324,10 +1324,12 @@ input:checked + .slide-container .properties {
 
 .reader .aside {
 	width: 0;
+	display: none;
 }
 
 .reader .aside:target {
 	width: 300px;
+	display: table-cell;
 }
 
 .reader .aside .stick {
@@ -1389,7 +1391,8 @@ input:checked + .slide-container .properties {
 		z-index: 100;
 	}
 
-	.aside:target {
+	.aside:target,
+	.reader .aside:target {
 		width: 90%;
 		height: 100vh;
 	}