Minor UI fixes for 4.0 (#6899)

* PLT-7056 - Fixing profile popover position

* PLT-7082 - Removing extra space below header

* PLT-7074 - Channel header fix

* PLT-7054 - Fixing scroll inside members popover

* Updating mention highlight color for default theme

webapp/sass/components/_popover.scss

@@ -242,6 +242,7 @@
             border-top: 1px solid;
             cursor: pointer;
             height: 45px;
+            overflow: hidden;
             padding: 5px 19px 5px 17px;
 
             &:hover {

webapp/sass/layout/_headers.scss

@@ -197,13 +197,13 @@
         display: inline-block;
         height: 35px;
         margin-top: -10px;
-        max-width: calc(100vw - 720px);
+        max-width: calc(100vw - 740px);
         overflow: hidden;
         padding: 3px 0 0;
         position: relative;
         text-overflow: ellipsis;
         top: 10px;
-        white-space: nowrap;
+        white-space: pre;
         word-break: break-word;
 
         .markdown__heading {
@@ -212,7 +212,7 @@
         }
 
         .multi-teams & {
-            max-width: calc(100vw - 790px);
+            max-width: calc(100vw - 810px);
         }
 
         &.light {
@@ -226,10 +226,10 @@
         }
 
         .move--left & {
-            max-width: calc(100vw - 790px);
+            max-width: calc(100vw - 810px);
 
             .multi-teams & {
-                max-width: calc(100vw - 840px);
+                max-width: calc(100vw - 860px);
             }
         }
 

webapp/sass/responsive/_mobile.scss

@@ -1043,8 +1043,8 @@
         @include single-transition(transform, .35s, ease);
         @include translate3d(290px, 0, 0);
         border: none;
-        width: 290px;
         visibility: hidden;
+        width: 290px;
 
         &.visible {
             display: block;
@@ -1287,10 +1287,10 @@
 
     .app__content {
         margin: 0;
-        padding-top: 56px;
+        padding-top: 50px;
 
         .channel__wrap & {
-            padding-top: 56px;
+            padding-top: 50px;
         }
 
         #channel-header {
@@ -1575,6 +1575,10 @@
 }
 
 @media screen and (max-width: 480px) {
+    #user-profile-popover {
+        left: 50px !important;
+    }
+
     .post {
         .img-div {
             max-width: 100%;

webapp/sass/responsive/_tablet.scss

@@ -5,20 +5,20 @@
         &.move--left {
             .channel-header {
                 .heading {
-                    max-width: calc(100vw - 600px);
+                    max-width: calc(100vw - 620px);
 
                     .multi-teams & {
-                        max-width: calc(100vw - 650px);
+                        max-width: calc(100vw - 670px);
                     }
                 }
             }
 
             .channel-header__info {
                 .channel-header__description {
-                    max-width: calc(100vw - 600px);
+                    max-width: calc(100vw - 620px);
 
                     .multi-teams & {
-                        max-width: calc(100vw - 650px);
+                        max-width: calc(100vw - 670px);
                     }
                 }
             }
@@ -34,20 +34,20 @@
 
     .channel-header__info {
         .channel-header__description {
-            max-width: calc(100vw - 660px);
+            max-width: calc(100vw - 680px);
 
             .multi-teams & {
-                max-width: calc(100vw - 710px);
+                max-width: calc(100vw - 730px);
             }
         }
     }
 
     .channel-header {
         .heading {
-            max-width: calc(100vw - 700px);
+            max-width: calc(100vw - 720px);
 
             .multi-teams & {
-                max-width: calc(100vw - 750px);
+                max-width: calc(100vw - 770px);
             }
         }
     }