diff --git a/web/viewer.css b/web/viewer.css
index 9452f51cf..32be338fb 100644
--- a/web/viewer.css
+++ b/web/viewer.css
@@ -735,7 +735,7 @@ html[dir='rtl'] .dropdownToolbarButton {
 }
 
 #pageWidthOption {
-  border-bottom: 1px rgba(255, 255, 255, .5) solid;
+  border-bottom: 1px rgba(255, 255, 255, 0.5) solid;
 }
 
 html[dir='ltr'] .splitToolbarButton:first-child,
@@ -1312,7 +1312,9 @@ html[dir='rtl'] .outlineItemToggler::before {
 /* TODO: file FF bug to support ::-moz-selection:window-inactive
    so we can override the opaque grey background when the window is inactive;
    see https://bugzilla.mozilla.org/show_bug.cgi?id=706209 */
-::selection { background: rgba(0,0,255,0.3); }
+::selection {
+  background: rgba(0, 0, 255, 0.3);
+}
 
 #errorWrapper {
   background: none repeat scroll 0 0 #FF5555;
@@ -1531,7 +1533,7 @@ html[dir='rtl'] #documentPropertiesOverlay .row > * {
 }
 
 #viewer.textLayer-shadow .textLayer > span {
-  background-color: rgba(255,255,255, .6);
+  background-color: rgba(255, 255, 255, 0.6);
   color: black;
 }