fix hr colors for dark theme, don't use hardcoded rgb value in light theme

css/prefs.less

@@ -128,7 +128,7 @@ body.ttrss_prefs {
 	}
 
 	hr {
-		border-color : #ecf4ff;
+		border-color : @border-default;
 		max-width : 100%;
 	}
 

themes/compact.css

@@ -1577,7 +1577,7 @@ body.ttrss_prefs .prefErrorLog tr .timestamp {
   color: #555;
 }
 body.ttrss_prefs hr {
-  border-color: #ecf4ff;
+  border-color: #ddd;
   max-width: 100%;
 }
 body.ttrss_prefs .phpinfo table {

themes/light.css

@@ -1577,7 +1577,7 @@ body.ttrss_prefs .prefErrorLog tr .timestamp {
   color: #555;
 }
 body.ttrss_prefs hr {
-  border-color: #ecf4ff;
+  border-color: #ddd;
   max-width: 100%;
 }
 body.ttrss_prefs .phpinfo table {

themes/night.css

@@ -1578,7 +1578,7 @@ body.ttrss_prefs .prefErrorLog tr .timestamp {
   color: #ccc;
 }
 body.ttrss_prefs hr {
-  border-color: #ecf4ff;
+  border-color: #222;
   max-width: 100%;
 }
 body.ttrss_prefs .phpinfo table {
@@ -2182,4 +2182,7 @@ body.flat.ttrss_main .alert {
   background: #222;
   border-color: #664518;
 }
+body.ttrss_prefs hr {
+  border-color: #666;
+}
 /*# sourceMappingURL=night.css.map */

themes/night_base.less

@@ -328,3 +328,8 @@ body.flat.ttrss_main {
 
 }
 
+body.ttrss_prefs {
+	hr {
+		border-color : @border-light;
+	}
+}

themes/night_blue.css

@@ -1578,7 +1578,7 @@ body.ttrss_prefs .prefErrorLog tr .timestamp {
   color: #ccc;
 }
 body.ttrss_prefs hr {
-  border-color: #ecf4ff;
+  border-color: #222;
   max-width: 100%;
 }
 body.ttrss_prefs .phpinfo table {
@@ -2182,4 +2182,7 @@ body.flat.ttrss_main .alert {
   background: #222;
   border-color: #133d54;
 }
+body.ttrss_prefs hr {
+  border-color: #666;
+}
 /*# sourceMappingURL=night_blue.css.map */