Re-use MR tabs styles to Epic tabs

app/assets/stylesheets/pages/merge_requests.scss

@@ -595,7 +595,6 @@
     color: $gl-text-color;
   }
 
-
   .git-merge-container {
     justify-content: space-between;
     flex: 1;
@@ -805,7 +804,8 @@
   }
 }
 
-.merge-request-tabs-holder {
+.merge-request-tabs-holder,
+.epic-tabs-holder {
   top: $header-height;
   z-index: 250;
   background-color: $white-light;
@@ -823,11 +823,6 @@
     @include media-breakpoint-down(xs) {
       right: 0;
     }
-
-    .merge-request-tabs-container {
-      padding-left: $gl-padding;
-      padding-right: $gl-padding;
-    }
   }
 
   .nav-links {
@@ -835,11 +830,21 @@
   }
 }
 
-.with-performance-bar .merge-request-tabs-holder {
+.merge-request-tabs-holder.affix .merge-request-tabs-container,
+.epic-tabs-holder.affix .epic-tabs-container {
+  padding-left: $gl-padding;
+  padding-right: $gl-padding;
+}
+
+.with-performance-bar {
+  .merge-request-tabs-holder,
+  .epic-tabs-holder {
     top: $header-height + $performance-bar-height;
+  }
 }
 
-.merge-request-tabs {
+.merge-request-tabs,
+.epic-tabs {
   display: flex;
   flex-wrap: nowrap;
   margin-bottom: 0;
@@ -847,7 +852,8 @@
 }
 
 .limit-container-width {
-  .merge-request-tabs-container {
+  .merge-request-tabs-container,
+  .epic-tabs-container {
     max-width: $limited-layout-width;
     margin-left: auto;
     margin-right: auto;
@@ -860,7 +866,8 @@
   }
 }
 
-.merge-request-tabs-container {
+.merge-request-tabs-container,
+.epic-tabs-container {
   display: flex;
   justify-content: space-between;
 
@@ -878,11 +885,10 @@
 }
 
 .limit-container-width:not(.container-limited) {
-  .merge-request-tabs-holder:not(.affix) {
-    .merge-request-tabs-container {
+  .merge-request-tabs-holder:not(.affix) .merge-request-tabs-container,
+  .epic-tabs-holder:not(.affix) .epic-tabs-container {
     max-width: $limited-layout-width - ($gl-padding * 2);
   }
-  }
 }
 
 .mr-memory-usage {