diff --git a/app/assets/stylesheets/admin.scss b/app/assets/stylesheets/admin.scss
index d2d2915f4..17a3739d0 100644
--- a/app/assets/stylesheets/admin.scss
+++ b/app/assets/stylesheets/admin.scss
@@ -155,10 +155,6 @@ $table-header:   #ecf1f6;
     color: $admin-color;
   }
 
-  .dropdown.menu > .is-dropdown-submenu-parent > a::after {
-    border-color: #000 transparent transparent;
-  }
-
   .fieldset {
 
     select {
@@ -295,7 +291,6 @@ $table-header:   #ecf1f6;
     }
 
     .is-active {
-      border-bottom: 2px solid $admin-color;
       color: $admin-color;
       font-weight: bold;
     }
@@ -455,7 +450,7 @@ code {
   &:hover,
   &:active,
   &:focus {
-    border-bottom: 1px dotted #fff;
+    border-bottom-color: transparent;
     color: #cf2a0e;
   }
 }
@@ -586,7 +581,7 @@ code {
   background: #fafafa;
   border-bottom-left-radius: rem-calc(6);
   border-bottom-right-radius: rem-calc(6);
-  border-top: 2px solid #000;
+  border-top: 2px solid;
   font-size: $small-font-size;
   padding: $line-height / 2;
 }
diff --git a/app/assets/stylesheets/dashboard.scss b/app/assets/stylesheets/dashboard.scss
index 711ae419b..42daef732 100644
--- a/app/assets/stylesheets/dashboard.scss
+++ b/app/assets/stylesheets/dashboard.scss
@@ -182,14 +182,13 @@
     background: #feeaeb;
 
     &::before {
-      border: 2px solid #fb9497;
       color: #fb9497;
       content: "\74";
     }
   }
 
   &::before {
-    border: 2px solid #00cb96;
+    border: 2px solid;
     border-radius: rem-calc(40);
     color: #00cb96;
     content: "\6c";
@@ -341,7 +340,7 @@
 
     &::before {
       background: linear-gradient(to right, rgba(231, 236, 240, 1) 0%, rgba(251, 251, 251, 1) 90%);
-      border-left: 4px solid $brand;
+      border-left: 4px solid;
       content: "";
       height: rem-calc(48);
       left: 0;
@@ -367,7 +366,7 @@
   }
 
   .submenu-active {
-    border-bottom: 2px solid $brand;
+    border-bottom: 2px solid;
 
     .has-tip {
       @include brand-text;
diff --git a/app/assets/stylesheets/layout.scss b/app/assets/stylesheets/layout.scss
index 9d459878b..313d06903 100644
--- a/app/assets/stylesheets/layout.scss
+++ b/app/assets/stylesheets/layout.scss
@@ -101,7 +101,7 @@ a {
 
 .button.hollow {
   @include normal-selection;
-  border: 1px solid $link;
+  border: 1px solid;
   color: $link;
 }
 
@@ -235,7 +235,7 @@ a {
 
     &.is-active {
       @include brand-text;
-      border-bottom: 2px solid $brand;
+      border-bottom: 2px solid;
       padding-bottom: rem-calc(1);
     }
 
@@ -272,7 +272,7 @@ a {
 
     &.is-active {
       @include brand-text;
-      border-bottom: 2px solid $brand;
+      border-bottom: 2px solid;
     }
   }
 
@@ -346,7 +346,7 @@ a {
 
       &::after {
         background: $brand;
-        border-bottom: 2px solid $brand;
+        border-bottom: 2px solid;
         bottom: 0;
         content: "";
         left: 0;
@@ -644,7 +644,7 @@ body > header,
   }
 
   &.is-dropdown-submenu-parent > a::after {
-    border-color: #fff transparent transparent;
+    border-top-color: currentcolor;
   }
 }
 
@@ -726,7 +726,7 @@ body > header,
 
       @include breakpoint(medium) {
         @include brand-text;
-        border-bottom: 2px solid $brand;
+        border-bottom: 2px solid;
       }
     }
   }
@@ -798,7 +798,7 @@ body > header,
 
   .is-active {
     @include brand-text;
-    border-bottom: 2px solid $brand;
+    border-bottom: 2px solid;
 
     &:hover {
       text-decoration: none;
@@ -2497,7 +2497,7 @@ table {
   &:hover,
   &:active,
   &:focus {
-    border-bottom: 1px solid #cf2a0e;
+    border-bottom-style: solid;
     color: #cf2a0e;
     text-decoration: none;
   }
diff --git a/app/assets/stylesheets/participation.scss b/app/assets/stylesheets/participation.scss
index aba94db5c..167ca4003 100644
--- a/app/assets/stylesheets/participation.scss
+++ b/app/assets/stylesheets/participation.scss
@@ -29,7 +29,7 @@
   .icon-like,
   .icon-unlike {
     background: #fff;
-    border: 2px solid $text-light;
+    border: 2px solid;
     border-radius: rem-calc(3);
     color: $text-light;
     display: inline-block;
@@ -1577,11 +1577,11 @@
   border-bottom: 1px solid #eee;
 
   .column:nth-child(odd) {
-    border-right: 2px solid $text;
+    border-right: 2px solid;
   }
 
   .answer-divider {
-    border-bottom: 2px solid $text;
+    border-bottom: 2px solid;
     border-right: 0 !important;
     margin-bottom: $line-height;
     padding-bottom: $line-height;
@@ -1776,7 +1776,7 @@
   margin: $line-height 0;
 
   span {
-    border-bottom: 1px solid #000;
+    border-bottom: 1px solid;
   }
 }