diff --git a/.stylelintrc b/.stylelintrc
index 0e1af52989..1f59d95834 100644
--- a/.stylelintrc
+++ b/.stylelintrc
@@ -62,5 +62,6 @@
         
         # Limit language features
         "color-no-hex": true,
+        "color-named": "never",
     }
 }
diff --git a/static/styles/compose.scss b/static/styles/compose.scss
index 7d856ccfb5..d9b273a406 100644
--- a/static/styles/compose.scss
+++ b/static/styles/compose.scss
@@ -265,7 +265,7 @@ div[id^="message-edit-send-status"],
     font-size: 17px;
     font-weight: bold;
     color: hsl(0, 0%, 0%);
-    text-shadow: 0 1px 0 white;
+    text-shadow: 0 1px 0 hsl(0, 0%, 100%);
     opacity: .2;
     filter: alpha(opacity=20);
     float: right;
@@ -303,7 +303,7 @@ div[id^="message-edit-send-status"],
     font-size: 17px;
     font-weight: bold;
     color: hsl(0, 0%, 0%);
-    text-shadow: 0 1px 0 white;
+    text-shadow: 0 1px 0 hsl(0, 0%, 100%);
     opacity: .2;
     filter: alpha(opacity=20);
 }
diff --git a/static/styles/night_mode.scss b/static/styles/night_mode.scss
index 47ab0bdc88..018bc2b3e8 100644
--- a/static/styles/night_mode.scss
+++ b/static/styles/night_mode.scss
@@ -62,7 +62,7 @@ body.night-mode {
     /* this one makes the border of the reactions highlighted on hovering. */
     .message_reaction:hover,
     .reaction_button:hover {
-        border-color: white !important;
+        border-color: hsl(0, 0%, 100%) !important;
     }
 
     /* do not turn the .message_header .stream_label text dark on hover because they're
diff --git a/static/styles/portico.scss b/static/styles/portico.scss
index 169902eb50..1eaf7f1e03 100644
--- a/static/styles/portico.scss
+++ b/static/styles/portico.scss
@@ -496,7 +496,7 @@ img.screenshot {
 .integration {
     margin-top: 2em;
     padding-top: 1em;
-    border-top: 1px dashed black;
+    border-top: 1px dashed hsl(0, 0%, 0%);
 }
 
 .integration p {
@@ -1005,7 +1005,7 @@ a.bottom-signup-button {
 
 .team input:checked + label {
     border: 1px solid hsl(0, 0%, 93%);
-    border-top: 2px solid yellowgreen;
+    border-top: 2px solid hsl(80, 61%, 50%);
     border-bottom-color: hsl(0, 0%, 100%);
 }
 
diff --git a/templates/zerver/emails/email.css b/templates/zerver/emails/email.css
index 60aec92bf2..bc7d2aa99c 100644
--- a/templates/zerver/emails/email.css
+++ b/templates/zerver/emails/email.css
@@ -185,14 +185,14 @@ a.button:hover {
 
 .recipient_block {
     background-color: #f0f4f5;
-    border: 1px solid black;
+    border: 1px solid #000000;
     margin-bottom: 4px;
 }
 
 .recipient_header {
     color: #e0dada;
     background-color: #444444;
-    border-bottom: 1px solid black;
+    border-bottom: 1px solid #000000;
     font-weight: bold;
     padding: 2px;
 }
@@ -221,13 +221,13 @@ a.button:hover {
 }
 
 .hot_convo_recipient_block {
-    border: 1px solid black;
+    border: 1px solid #000000;
     margin-bottom: 4px;
 }
 
 .hot_convo_recipient_header {
     background-color: #9ec9ff;
-    border-bottom: 1px solid black;
+    border-bottom: 1px solid #000000;
     font-weight: bold;
     padding: 2px;
 }
@@ -243,13 +243,13 @@ a.button:hover {
 }
 
 .recipient_block_with_messages {
-    border: 1px solid black;
+    border: 1px solid #000000;
     margin-bottom: 4px;
 }
 
 .recipient_header_with_messages {
     background-color: #9ecaff;
-    border-bottom: 1px solid black;
+    border-bottom: 1px solid #000000;
     font-weight: bold;
     padding: 2px;
 }
@@ -261,14 +261,14 @@ a.button:hover {
 
 .recipient_block_without_messages {
     background-color: #f0f4f5;
-    border: 1px solid black;
+    border: 1px solid #000000;
     margin-bottom: 4px;
 }
 
 .recipient_header_without_messages {
     color: #ffffff;
     background-color: #444444;
-    border-bottom: 1px solid black;
+    border-bottom: 1px solid #000000;
     font-weight: bold;
     padding: 2px;
 }
diff --git a/version.py b/version.py
index 95adfe8e49..c3cdb2f885 100644
--- a/version.py
+++ b/version.py
@@ -11,4 +11,4 @@ LATEST_RELEASE_ANNOUNCEMENT = "https://blog.zulip.org/2018/11/07/zulip-1-9-relea
 # Typically, adding a dependency only requires a minor version bump, and
 # removing a dependency requires a major version bump.
 
-PROVISION_VERSION = '27.1'
+PROVISION_VERSION = '27.2'