diff --git a/static/styles/alerts.scss b/static/styles/alerts.scss
index 8a42f33d16..f93cf7c210 100644
--- a/static/styles/alerts.scss
+++ b/static/styles/alerts.scss
@@ -57,10 +57,7 @@ $alert-error-red: hsl(0, 80%, 40%);
     overscroll-behavior: contain;
 
     .stacktrace {
-        @extend .alert-display;
-    }
-    .stacktrace {
-        @extend .alert-animations;
+        @extend .alert-display, .alert-animations;
 
         font-size: 1rem;
         color: hsl(0, 80%, 40%);
diff --git a/static/styles/compose.scss b/static/styles/compose.scss
index 739dfa241e..b69ef5d0c2 100644
--- a/static/styles/compose.scss
+++ b/static/styles/compose.scss
@@ -45,6 +45,14 @@
 .compose-content {
     border-top: 1px solid hsla(0, 0%, 0%, 0.07);
     transition: background-color 200ms linear;
+
+    padding: 8px 10px 8px 10px;
+    margin-left: 250px;
+    margin-right: 250px;
+    position: relative;
+
+    border-left: 1px solid hsl(0, 0%, 93%);
+    border-right: 1px solid hsl(0, 0%, 93%);
 }
 
 .ztable_comp_col1 {
@@ -165,16 +173,6 @@
     margin: auto;
 }
 
-.compose-content {
-    padding: 8px 10px 8px 10px;
-    margin-left: 250px;
-    margin-right: 250px;
-    position: relative;
-
-    border-left: 1px solid hsl(0, 0%, 93%);
-    border-right: 1px solid hsl(0, 0%, 93%);
-}
-
 #compose_close {
     display: none;
     position: absolute;
diff --git a/static/styles/night_mode.scss b/static/styles/night_mode.scss
index 70a20f28da..3efc713d3b 100644
--- a/static/styles/night_mode.scss
+++ b/static/styles/night_mode.scss
@@ -236,10 +236,6 @@ on a dark background, and don't change the dark labels dark either. */
     .message-header-contents,
     .message_header_private_message .message-header-contents {
         background-color: hsla(0, 0%, 0%, 0.2);
-    }
-
-    .message-header-contents,
-    .message_header_private_message .message-header-contents {
         border-color: transparent;
     }
 
diff --git a/static/styles/popovers.scss b/static/styles/popovers.scss
index d275ff27a6..203168b833 100644
--- a/static/styles/popovers.scss
+++ b/static/styles/popovers.scss
@@ -167,6 +167,15 @@ ul {
 
     margin: -14px;
     padding: 0;
+
+    .popover-title {
+        padding: 0;
+        border-color: hsla(0, 0%, 0%, 0.2);
+    }
+
+    .popover_info li {
+        word-wrap: break-word;
+    }
 }
 
 .message-info-popover {
@@ -228,17 +237,6 @@ ul {
     }
 }
 
-.user_popover {
-    .popover-title {
-        padding: 0;
-        border-color: hsla(0, 0%, 0%, 0.2);
-    }
-
-    .popover_info li {
-        word-wrap: break-word;
-    }
-}
-
 .popover-avatar {
     height: 240px;
     width: 240px;
diff --git a/static/styles/portico/landing-page.scss b/static/styles/portico/landing-page.scss
index 1134b954d7..b080501d59 100644
--- a/static/styles/portico/landing-page.scss
+++ b/static/styles/portico/landing-page.scss
@@ -351,9 +351,7 @@ nav {
     padding-top: 120px;
 
     z-index: 1;
-}
 
-.portico-landing {
     &.show {
         opacity: 1;
     }
@@ -2057,9 +2055,6 @@ nav {
 .portico-landing.apps .hero h1 {
     font-size: 3em;
     margin-bottom: 0px;
-}
-
-.portico-landing.apps .hero h1 {
     margin-top: 0px;
 }
 
@@ -3303,9 +3298,6 @@ nav {
     .portico-landing.why-page .hero {
         padding-left: 20px;
         padding-right: 20px;
-    }
-
-    .portico-landing.why-page .hero {
         font-size: 0.6em;
     }
 
@@ -3464,28 +3456,24 @@ nav {
     }
 
     nav {
-        ul {
-            margin-top: 0px;
-            text-align: left;
-        }
-
-        .content {
-            display: inline-block;
-            z-index: 11;
-        }
-
         .hamburger {
             display: inline-block;
             float: right;
         }
 
         .content {
+            display: inline-block;
+            z-index: 11;
+
             > ul.show {
                 outline-color: hsla(203, 43%, 22%, 0.7);
             }
         }
 
         ul {
+            margin-top: 0px;
+            text-align: left;
+
             position: fixed;
             float: none;
             top: 0;
diff --git a/static/styles/portico/portico.scss b/static/styles/portico/portico.scss
index f9c19bec88..947021505a 100644
--- a/static/styles/portico/portico.scss
+++ b/static/styles/portico/portico.scss
@@ -54,7 +54,7 @@ html {
 .header {
     position: relative;
 
-    padding: 6px 0px;
+    padding: 15px 0;
     height: 29px;
 
     background-color: hsl(0, 0%, 100%);
@@ -545,10 +545,6 @@ input.text-error {
 
 /* -- end new footer -- */
 
-.header {
-    padding: 15px 0;
-}
-
 .header-main {
     .logo {
         display: block;
@@ -1594,10 +1590,6 @@ label.label-title {
     font-weight: 600;
 }
 
-input.new-organization-button {
-    margin-left: auto;
-}
-
 .inline-block {
     display: inline-block;
     vertical-align: top;
diff --git a/static/styles/settings.scss b/static/styles/settings.scss
index e7ecde4fb1..57ab7abd26 100644
--- a/static/styles/settings.scss
+++ b/static/styles/settings.scss
@@ -455,95 +455,6 @@ input[type="checkbox"] {
     }
 }
 
-#settings_page {
-    .icon-button {
-        border-radius: 5px;
-        border: 1px solid hsl(0, 0%, 80%);
-        font-size: 14px;
-        padding: 3px 14px 4px 11px;
-        text-decoration: none;
-        color: hsl(0, 0%, 47%);
-        min-width: 80px;
-        line-height: 16px;
-
-        &:hover {
-            background-color: hsl(0, 0%, 100%);
-            border: 1px solid hsl(0, 0%, 61%);
-            color: hsl(0, 0%, 18%);
-
-            .icon-button-icon {
-                color: hsl(0, 0%, 47%);
-            }
-        }
-
-        &.primary {
-            background-color: hsl(156, 30%, 50%);
-            color: hsl(0, 0%, 100%);
-            border: 1px solid hsl(155, 30%, 50%);
-
-            &:hover {
-                background-color: hsl(166, 35%, 57%);
-                border: 1px solid hsl(166, 35%, 57%);
-            }
-
-            .icon-button-icon {
-                font-weight: lighter;
-                color: hsl(0, 0%, 100%);
-            }
-
-            &.saving {
-                background-color: hsl(156, 14%, 40%);
-                border-color: hsl(156, 14%, 40%);
-            }
-        }
-
-        .icon-button-icon {
-            vertical-align: bottom;
-            margin-right: 3px;
-            margin-bottom: 1px;
-            font-size: 15px;
-            font-weight: 500;
-        }
-    }
-
-    .save-button-controls {
-        display: inline;
-        margin-left: 15px;
-
-        &.hide {
-            display: none;
-        }
-    }
-
-    .save-button {
-        margin-right: 5px;
-
-        .icon-button-loading {
-            display: none;
-        }
-
-        &.saving {
-            .icon-button-icon {
-                display: none;
-            }
-
-            .icon-button-loading {
-                display: inline-block;
-                margin-right: 2px;
-            }
-        }
-    }
-
-    .admin-realm-time-limit-input {
-        width: 5ch;
-        text-align: right;
-    }
-
-    .realm-time-limit-label {
-        vertical-align: middle;
-    }
-}
-
 .organization-settings-parent > div:first-of-type {
     margin-top: 10px;
 }
@@ -1179,6 +1090,93 @@ input[type="checkbox"] {
     overflow: hidden;
     border-radius: 4px;
 
+    .icon-button {
+        border-radius: 5px;
+        border: 1px solid hsl(0, 0%, 80%);
+        font-size: 14px;
+        padding: 3px 14px 4px 11px;
+        text-decoration: none;
+        color: hsl(0, 0%, 47%);
+        min-width: 80px;
+        line-height: 16px;
+
+        &:hover {
+            background-color: hsl(0, 0%, 100%);
+            border: 1px solid hsl(0, 0%, 61%);
+            color: hsl(0, 0%, 18%);
+
+            .icon-button-icon {
+                color: hsl(0, 0%, 47%);
+            }
+        }
+
+        &.primary {
+            background-color: hsl(156, 30%, 50%);
+            color: hsl(0, 0%, 100%);
+            border: 1px solid hsl(155, 30%, 50%);
+
+            &:hover {
+                background-color: hsl(166, 35%, 57%);
+                border: 1px solid hsl(166, 35%, 57%);
+            }
+
+            .icon-button-icon {
+                font-weight: lighter;
+                color: hsl(0, 0%, 100%);
+            }
+
+            &.saving {
+                background-color: hsl(156, 14%, 40%);
+                border-color: hsl(156, 14%, 40%);
+            }
+        }
+
+        .icon-button-icon {
+            vertical-align: bottom;
+            margin-right: 3px;
+            margin-bottom: 1px;
+            font-size: 15px;
+            font-weight: 500;
+        }
+    }
+
+    .save-button-controls {
+        display: inline;
+        margin-left: 15px;
+
+        &.hide {
+            display: none;
+        }
+    }
+
+    .save-button {
+        margin-right: 5px;
+
+        .icon-button-loading {
+            display: none;
+        }
+
+        &.saving {
+            .icon-button-icon {
+                display: none;
+            }
+
+            .icon-button-loading {
+                display: inline-block;
+                margin-right: 2px;
+            }
+        }
+    }
+
+    .admin-realm-time-limit-input {
+        width: 5ch;
+        text-align: right;
+    }
+
+    .realm-time-limit-label {
+        vertical-align: middle;
+    }
+
     h3 {
         font-size: 1.5em;
         font-weight: normal;
diff --git a/static/styles/widgets.scss b/static/styles/widgets.scss
index edcc7915c8..16a532b5a6 100644
--- a/static/styles/widgets.scss
+++ b/static/styles/widgets.scss
@@ -76,6 +76,20 @@ button {
         border-color: hsl(157, 18%, 77%);
         padding: 0px;
     }
+
+    &.add-task,
+    &.add-desc,
+    &.poll-option,
+    &.poll-question {
+        border-radius: 3px;
+        border: 1px solid hsl(0, 0%, 80%);
+        background-color: hsl(0, 0%, 100%);
+        width: 100px;
+
+        &:hover {
+            border-color: hsl(0, 0%, 60%);
+        }
+    }
 }
 
 img.task-completed {
@@ -93,22 +107,6 @@ button {
     }
 }
 
-button {
-    &.add-task,
-    &.add-desc,
-    &.poll-option,
-    &.poll-question {
-        border-radius: 3px;
-        border: 1px solid hsl(0, 0%, 80%);
-        background-color: hsl(0, 0%, 100%);
-        width: 100px;
-
-        &:hover {
-            border-color: hsl(0, 0%, 60%);
-        }
-    }
-}
-
 .widget-error {
     color: hsl(1, 45%, 50%);
     font-size: 12px;
diff --git a/static/styles/zulip.scss b/static/styles/zulip.scss
index 0a5a336a61..180b5fb49a 100644
--- a/static/styles/zulip.scss
+++ b/static/styles/zulip.scss
@@ -922,9 +922,6 @@ td.pointer {
 .summary_row {
     .message_header {
         padding: 5px 0px 4px 5px;
-    }
-
-    .message_header {
         border-radius: 0;
     }
 
@@ -2562,14 +2559,10 @@ select.inline_select_topic_edit {
         box-shadow: 0px 0px 5px hsla(0, 0%, 0%, 0.2);
 
         &::after {
-            right: 10px;
+            right: 21px;
         }
     }
 
-    .nav .dropdown-menu::after {
-        right: 21px;
-    }
-
     .column-middle {
         margin-right: 7px;
     }
@@ -2759,17 +2752,13 @@ select.inline_select_topic_edit {
 
     #message_view_header_underpadding {
         top: 30px;
+        height: 10px;
     }
 
     .messagebox-content {
         padding-right: 15px;
     }
 
-    .message_time {
-        right: auto;
-        left: -3px;
-    }
-
     /* In mobile views we place it just to the right of the time element */
     .message_controls {
         right: 40px;
@@ -2794,10 +2783,6 @@ select.inline_select_topic_edit {
         line-height: 15px;
     }
 
-    #message_view_header_underpadding {
-        height: 10px;
-    }
-
     #floating_recipient_bar {
         top: 40px;
     }
diff --git a/stylelint.config.js b/stylelint.config.js
index 3c62cccfc0..5e744bdef2 100644
--- a/stylelint.config.js
+++ b/stylelint.config.js
@@ -10,7 +10,6 @@ module.exports = {
         // Disable recommended rules we don't comply with yet
         "font-family-no-missing-generic-family-keyword": null,
         "no-descending-specificity": null,
-        "no-duplicate-selectors": null,
 
         // Disable standard rules we don't comply with yet
         "comment-empty-line-before": null,