diff --git a/.stylelintrc b/.stylelintrc
index 4645f82e9c81e..b0648af5cc4d8 100644
--- a/.stylelintrc
+++ b/.stylelintrc
@@ -13,5 +13,6 @@
     "length-zero-no-unit": [true, {
       ignore: ["custom-properties"]
     }],
+    "shorthand-property-no-redundant-values": true,
   },
 }
diff --git a/web/pdf_viewer.css b/web/pdf_viewer.css
index e2e2193be5d5a..15187667df5be 100644
--- a/web/pdf_viewer.css
+++ b/web/pdf_viewer.css
@@ -23,7 +23,7 @@
   direction: ltr;
   width: 816px;
   height: 1056px;
-  margin: 1px auto -8px auto;
+  margin: 1px auto -8px;
   position: relative;
   overflow: visible;
   border: 9px solid transparent;
@@ -33,7 +33,7 @@
 }
 
 .pdfViewer.removePageBorders .page {
-  margin: 0 auto 10px auto;
+  margin: 0 auto 10px;
   border: none;
 }
 
diff --git a/web/viewer.css b/web/viewer.css
index 8226b5faeeeeb..a6bd239fd19a0 100644
--- a/web/viewer.css
+++ b/web/viewer.css
@@ -456,8 +456,8 @@ html[dir="rtl"] #outerContainer.sidebarOpen #loadingBar {
   z-index: 10000;
   height: auto;
   min-width: 16px;
-  padding: 0 4px 0 4px;
-  margin: 4px 2px 4px 2px;
+  padding: 0 4px;
+  margin: 4px 2px;
   color: rgba(217, 217, 217, 1);
   font-size: 12px;
   line-height: 14px;
@@ -571,7 +571,7 @@ html[dir="rtl"] #findInput[data-status="pending"] {
 }
 
 .secondaryToolbar {
-  padding: 6px 0 10px 0;
+  padding: 6px 0 10px;
   height: auto;
   z-index: 30000;
   background-color: var(--doorhanger-bg-color);
@@ -1079,7 +1079,7 @@ html[dir="rtl"] .toolbarButton.pdfSidebarNotification::after {
 .secondaryToolbarButton {
   position: relative;
   margin: 0;
-  padding: 0 0 1px 0;
+  padding: 0 0 1px;
   height: auto;
   min-height: 26px;
   width: auto;
@@ -1185,7 +1185,7 @@ html[dir="rtl"] .verticalToolbarSeparator {
 
 .horizontalToolbarSeparator {
   display: block;
-  margin: 6px 0 5px 0;
+  margin: 6px 0 5px;
   height: 1px;
   width: 100%;
   border-top: 1px solid var(--doorhanger-separator-color);
@@ -1193,7 +1193,7 @@ html[dir="rtl"] .verticalToolbarSeparator {
 
 .toolbarField {
   padding: 4px 7px;
-  margin: 3px 0 3px 0;
+  margin: 3px 0;
   border-radius: 2px;
   background-color: var(--field-bg-color);
   background-clip: padding-box;
@@ -1281,7 +1281,7 @@ html[dir="rtl"] #numPages.toolbarLabel {
 }
 
 .thumbnail {
-  margin: 0 10px 5px 10px;
+  margin: 0 10px 5px;
 }
 html[dir="ltr"] .thumbnail {
   float: left;
@@ -1300,7 +1300,7 @@ html[dir="rtl"] .thumbnail {
 
 .thumbnail:not([data-loaded]) {
   border: 1px dashed rgba(132, 132, 132, 1);
-  margin: -1px 9px 4px 9px;
+  margin: -1px 9px 4px;
 }
 
 .thumbnailImage {
@@ -1479,8 +1479,8 @@ html[dir="rtl"] .treeItemToggler::before {
 
 .overlayButton {
   width: auto;
-  margin: 3px 4px 2px 4px !important;
-  padding: 2px 11px 2px 11px;
+  margin: 3px 4px 2px !important;
+  padding: 2px 11px;
 }
 
 #overlayContainer {
@@ -1529,7 +1529,7 @@ html[dir="rtl"] .treeItemToggler::before {
 
 .dialog .separator {
   display: block;
-  margin: 4px 0 4px 0;
+  margin: 4px 0;
   height: 1px;
   width: 100%;
   background-color: var(--separator-color);