diff --git a/templates/repo/diff/section_split.tmpl b/templates/repo/diff/section_split.tmpl
index a1a5f5ba5..c543a2a06 100644
--- a/templates/repo/diff/section_split.tmpl
+++ b/templates/repo/diff/section_split.tmpl
@@ -47,7 +47,7 @@
 					<td class="lines-type-marker lines-type-marker-old del-code"><span class="gt-mono" data-type-marker="{{$line.GetLineTypeMarker}}"></span></td>
 					<td class="lines-code lines-code-old del-code">{{/*
 						*/}}{{if and $.root.SignedUserID $.root.PageIsPullFiles}}{{/*
-							*/}}<button type="button" aria-label="{{$.root.locale.Tr "repo.diff.comment.add_line_comment"}}" class="ui primary button add-code-comment add-code-comment-left{{if (not $line.CanComment)}} invisible{{end}}" data-side="left" data-idx="{{$line.LeftIdx}}">{{/*
+							*/}}<button type="button" aria-label="{{$.root.locale.Tr "repo.diff.comment.add_line_comment"}}" class="ui primary button add-code-comment add-code-comment-left{{if (not $line.CanComment)}} gt-invisible{{end}}" data-side="left" data-idx="{{$line.LeftIdx}}">{{/*
 								*/}}{{svg "octicon-plus"}}{{/*
 							*/}}</button>{{/*
 						*/}}{{end}}{{/*
@@ -62,7 +62,7 @@
 					<td class="lines-type-marker lines-type-marker-new add-code">{{if $match.RightIdx}}<span class="gt-mono" data-type-marker="{{$match.GetLineTypeMarker}}"></span>{{end}}</td>
 					<td class="lines-code lines-code-new add-code">{{/*
 						*/}}{{if and $.root.SignedUserID $.root.PageIsPullFiles}}{{/*
-							*/}}<button type="button" aria-label="{{$.root.locale.Tr "repo.diff.comment.add_line_comment"}}" class="ui primary button add-code-comment add-code-comment-right{{if (not $match.CanComment)}} invisible{{end}}" data-side="right" data-idx="{{$match.RightIdx}}">{{/*
+							*/}}<button type="button" aria-label="{{$.root.locale.Tr "repo.diff.comment.add_line_comment"}}" class="ui primary button add-code-comment add-code-comment-right{{if (not $match.CanComment)}} gt-invisible{{end}}" data-side="right" data-idx="{{$match.RightIdx}}">{{/*
 								*/}}{{svg "octicon-plus"}}{{/*
 							*/}}</button>{{/*
 						*/}}{{end}}{{/*
@@ -79,7 +79,7 @@
 					<td class="lines-type-marker lines-type-marker-old">{{if $line.LeftIdx}}<span class="gt-mono" data-type-marker="{{$line.GetLineTypeMarker}}"></span>{{end}}</td>
 					<td class="lines-code lines-code-old">{{/*
 						*/}}{{if and $.root.SignedUserID $.root.PageIsPullFiles (not (eq .GetType 2))}}{{/*
-							*/}}<button type="button" aria-label="{{$.root.locale.Tr "repo.diff.comment.add_line_comment"}}" class="ui primary button add-code-comment add-code-comment-left{{if (not $line.CanComment)}} invisible{{end}}" data-side="left" data-idx="{{$line.LeftIdx}}">{{/*
+							*/}}<button type="button" aria-label="{{$.root.locale.Tr "repo.diff.comment.add_line_comment"}}" class="ui primary button add-code-comment add-code-comment-left{{if (not $line.CanComment)}} gt-invisible{{end}}" data-side="left" data-idx="{{$line.LeftIdx}}">{{/*
 								*/}}{{svg "octicon-plus"}}{{/*
 							*/}}</button>{{/*
 						*/}}{{end}}{{/*
@@ -94,7 +94,7 @@
 					<td class="lines-type-marker lines-type-marker-new">{{if $line.RightIdx}}<span class="gt-mono" data-type-marker="{{$line.GetLineTypeMarker}}"></span>{{end}}</td>
 					<td class="lines-code lines-code-new">{{/*
 						*/}}{{if and $.root.SignedUserID $.root.PageIsPullFiles (not (eq .GetType 3))}}{{/*
-							*/}}<button type="button" aria-label="{{$.root.locale.Tr "repo.diff.comment.add_line_comment"}}" class="ui primary button add-code-comment add-code-comment-right{{if (not $line.CanComment)}} invisible{{end}}" data-side="right" data-idx="{{$line.RightIdx}}">{{/*
+							*/}}<button type="button" aria-label="{{$.root.locale.Tr "repo.diff.comment.add_line_comment"}}" class="ui primary button add-code-comment add-code-comment-right{{if (not $line.CanComment)}} gt-invisible{{end}}" data-side="right" data-idx="{{$line.RightIdx}}">{{/*
 								*/}}{{svg "octicon-plus"}}{{/*
 							*/}}</button>{{/*
 						*/}}{{end}}{{/*
diff --git a/templates/repo/diff/section_unified.tmpl b/templates/repo/diff/section_unified.tmpl
index 98e382a0c..f59832548 100644
--- a/templates/repo/diff/section_unified.tmpl
+++ b/templates/repo/diff/section_unified.tmpl
@@ -52,7 +52,7 @@
 			{{else}}
 				<td class="chroma lines-code{{if (not $line.RightIdx)}} lines-code-old{{end}}">{{/*
 					*/}}{{if and $.root.SignedUserID $.root.PageIsPullFiles}}{{/*
-						*/}}<button type="button" aria-label="{{$.root.locale.Tr "repo.diff.comment.add_line_comment"}}" class="ui primary button add-code-comment add-code-comment-{{if $line.RightIdx}}right{{else}}left{{end}}{{if (not $line.CanComment)}} invisible{{end}}" data-side="{{if $line.RightIdx}}right{{else}}left{{end}}" data-idx="{{if $line.RightIdx}}{{$line.RightIdx}}{{else}}{{$line.LeftIdx}}{{end}}">{{/*
+						*/}}<button type="button" aria-label="{{$.root.locale.Tr "repo.diff.comment.add_line_comment"}}" class="ui primary button add-code-comment add-code-comment-{{if $line.RightIdx}}right{{else}}left{{end}}{{if (not $line.CanComment)}} gt-invisible{{end}}" data-side="{{if $line.RightIdx}}right{{else}}left{{end}}" data-idx="{{if $line.RightIdx}}{{$line.RightIdx}}{{else}}{{$line.LeftIdx}}{{end}}">{{/*
 							*/}}{{svg "octicon-plus"}}{{/*
 						*/}}</button>{{/*
 					*/}}{{end}}{{/*
diff --git a/templates/repo/issue/labels/labels_selector_field.tmpl b/templates/repo/issue/labels/labels_selector_field.tmpl
index bdec96e6a..f8d38d035 100644
--- a/templates/repo/issue/labels/labels_selector_field.tmpl
+++ b/templates/repo/issue/labels/labels_selector_field.tmpl
@@ -21,18 +21,18 @@
 					<div class="divider"></div>
 				{{end}}
 				{{$previousExclusiveScope = $exclusiveScope}}
-				<a class="{{if .IsChecked}}checked{{end}} item" href="#" data-id="{{.ID}}" data-id-selector="#label_{{.ID}}" data-scope="{{$exclusiveScope}}"><span class="octicon-check {{if not .IsChecked}}invisible{{end}}">{{if $exclusiveScope}}{{svg "octicon-dot-fill"}}{{else}}{{svg "octicon-check"}}{{end}}</span>&nbsp;&nbsp;{{RenderLabel $.Context .}}
+				<a class="{{if .IsChecked}}checked{{end}} item" href="#" data-id="{{.ID}}" data-id-selector="#label_{{.ID}}" data-scope="{{$exclusiveScope}}"><span class="octicon-check {{if not .IsChecked}}gt-invisible{{end}}">{{if $exclusiveScope}}{{svg "octicon-dot-fill"}}{{else}}{{svg "octicon-check"}}{{end}}</span>&nbsp;&nbsp;{{RenderLabel $.Context .}}
 				{{if .Description}}<br><small class="desc">{{.Description | RenderEmoji $.Context}}</small>{{end}}</a>
 			{{end}}
 			<div class="divider"></div>
-			{{$previousExclusiveScope := "_no_scope"}}
+			{{$previousExclusiveScope = "_no_scope"}}
 			{{range .OrgLabels}}
 				{{$exclusiveScope := .ExclusiveScope}}
 				{{if and (ne $previousExclusiveScope "_no_scope") (ne $previousExclusiveScope $exclusiveScope)}}
 					<div class="divider"></div>
 				{{end}}
 				{{$previousExclusiveScope = $exclusiveScope}}
-				<a class="{{if .IsChecked}}checked{{end}} item" href="#" data-id="{{.ID}}" data-id-selector="#label_{{.ID}}" data-scope="{{$exclusiveScope}}"><span class="octicon-check {{if not .IsChecked}}invisible{{end}}">{{if $exclusiveScope}}{{svg "octicon-dot-fill"}}{{else}}{{svg "octicon-check"}}{{end}}</span>&nbsp;&nbsp;{{RenderLabel $.Context .}}
+				<a class="{{if .IsChecked}}checked{{end}} item" href="#" data-id="{{.ID}}" data-id-selector="#label_{{.ID}}" data-scope="{{$exclusiveScope}}"><span class="octicon-check {{if not .IsChecked}}gt-invisible{{end}}">{{if $exclusiveScope}}{{svg "octicon-dot-fill"}}{{else}}{{svg "octicon-check"}}{{end}}</span>&nbsp;&nbsp;{{RenderLabel $.Context .}}
 				{{if .Description}}<br><small class="desc">{{.Description | RenderEmoji $.Context}}</small>{{end}}</a>
 			{{end}}
 		{{else}}
diff --git a/templates/repo/issue/new_form.tmpl b/templates/repo/issue/new_form.tmpl
index ca1ff287d..fc1a3d087 100644
--- a/templates/repo/issue/new_form.tmpl
+++ b/templates/repo/issue/new_form.tmpl
@@ -158,7 +158,7 @@
 					<div class="no-select item">{{.locale.Tr "repo.issues.new.clear_assignees"}}</div>
 					{{range .Assignees}}
 						<a class="item muted" href="#" data-id="{{.ID}}" data-id-selector="#assignee_{{.ID}}">
-							<span class="octicon-check invisible">{{svg "octicon-check"}}</span>
+							<span class="octicon-check gt-invisible">{{svg "octicon-check"}}</span>
 							<span class="text">
 								{{ctx.AvatarUtils.Avatar . 28 "gt-mr-3"}}{{template "repo/search_name" .}}
 							</span>
diff --git a/templates/repo/issue/view_content/sidebar.tmpl b/templates/repo/issue/view_content/sidebar.tmpl
index ff4239bbb..63a6a14a2 100644
--- a/templates/repo/issue/view_content/sidebar.tmpl
+++ b/templates/repo/issue/view_content/sidebar.tmpl
@@ -20,7 +20,7 @@
 					{{range .Reviewers}}
 						{{if .User}}
 							<a class="{{if not .CanChange}}ui{{end}} item {{if .Checked}}checked{{end}} {{if not .CanChange}}ban-change{{end}}" href="#" data-id="{{.ItemID}}" data-id-selector="#review_request_{{.ItemID}}" {{if not .CanChange}} data-tooltip-content="{{$.locale.Tr "repo.issues.remove_request_review_block"}}"{{end}}>
-								<span class="octicon-check {{if not .Checked}}invisible{{end}}">{{svg "octicon-check"}}</span>
+								<span class="octicon-check {{if not .Checked}}gt-invisible{{end}}">{{svg "octicon-check"}}</span>
 								<span class="text">
 									{{ctx.AvatarUtils.Avatar .User 28 "gt-mr-3"}}{{template "repo/search_name" .User}}
 								</span>
@@ -33,7 +33,7 @@
 					{{range .TeamReviewers}}
 						{{if .Team}}
 							<a class="{{if not .CanChange}}ui{{end}} item {{if .Checked}}checked{{end}} {{if not .CanChange}}ban-change{{end}}" href="#" data-id="{{.ItemID}}" data-id-selector="#review_request_team_{{.Team.ID}}" {{if not .CanChange}} data-tooltip-content="{{$.locale.Tr "repo.issues.remove_request_review_block"}}"{{end}}>
-								<span class="octicon-check {{if not .Checked}}invisible{{end}}">{{svg "octicon-check" 16}}</span>
+								<span class="octicon-check {{if not .Checked}}gt-invisible{{end}}">{{svg "octicon-check" 16}}</span>
 								<span class="text">
 									{{svg "octicon-people" 16 "gt-ml-4 gt-mr-2"}}{{$.Issue.Repo.OwnerName}}/{{.Team.Name}}
 								</span>
@@ -229,7 +229,7 @@
 							{{$checked = true}}
 						{{end}}
 					{{end}}
-					<span class="octicon-check {{if not $checked}}invisible{{end}}">{{svg "octicon-check"}}</span>
+					<span class="octicon-check {{if not $checked}}gt-invisible{{end}}">{{svg "octicon-check"}}</span>
 					<span class="text">
 						{{ctx.AvatarUtils.Avatar . 20 "gt-mr-3"}}{{template "repo/search_name" .}}
 					</span>
diff --git a/web_src/css/base.css b/web_src/css/base.css
index 7c65b6aaf..20ddf0148 100644
--- a/web_src/css/base.css
+++ b/web_src/css/base.css
@@ -506,13 +506,6 @@ a.label,
   border-right-color: var(--color-primary);
 }
 
-/* fix button enlarged vertically by svg icon */
-/* TODO: change to just `.small.button:has(svg)` but may have global side effects */
-.ui.action.input .small.button:has(svg) {
-  padding-top: 7px !important;
-  padding-bottom: 7px !important;
-}
-
 .ui.menu,
 .ui.vertical.menu {
   background: var(--color-menu);
@@ -953,14 +946,6 @@ img.ui.avatar,
   filter: saturate(2);
 }
 
-/* TODO: use gt-word-break instead */
-.dont-break-out {
-  overflow-wrap: break-word;
-  word-wrap: break-word;
-  word-break: break-all;
-  hyphens: auto;
-}
-
 .full.height {
   flex-grow: 1;
   padding-bottom: 80px;
@@ -2014,11 +1999,6 @@ a.ui.basic.label:hover {
   margin-left: 0;
 }
 
-/* TODO: replace it with gt-invisible */
-.invisible {
-  visibility: hidden;
-}
-
 .ui.segment,
 .ui.segments,
 .ui.attached.segment {
diff --git a/web_src/js/features/repo-diff.js b/web_src/js/features/repo-diff.js
index b79ca0f5b..864b28a3b 100644
--- a/web_src/js/features/repo-diff.js
+++ b/web_src/js/features/repo-diff.js
@@ -64,9 +64,9 @@ function initRepoDiffConversationForm() {
 
     $form.closest('.conversation-holder').replaceWith($newConversationHolder);
     if ($form.closest('tr').data('line-type') === 'same') {
-      $(`[data-path="${path}"] .add-code-comment[data-idx="${idx}"]`).addClass('invisible');
+      $(`[data-path="${path}"] .add-code-comment[data-idx="${idx}"]`).addClass('gt-invisible');
     } else {
-      $(`[data-path="${path}"] .add-code-comment[data-side="${side}"][data-idx="${idx}"]`).addClass('invisible');
+      $(`[data-path="${path}"] .add-code-comment[data-side="${side}"][data-idx="${idx}"]`).addClass('gt-invisible');
     }
     $newConversationHolder.find('.dropdown').dropdown();
     initCompReactionSelector($newConversationHolder);
diff --git a/web_src/js/features/repo-issue.js b/web_src/js/features/repo-issue.js
index 194ffca57..4f4103bb2 100644
--- a/web_src/js/features/repo-issue.js
+++ b/web_src/js/features/repo-issue.js
@@ -110,7 +110,7 @@ export function initRepoIssueSidebarList() {
             }
             filteredResponse.results.push({
               name: `#${issue.number} ${htmlEscape(issue.title)
-              }<div class="text small dont-break-out">${htmlEscape(issue.repository.full_name)}</div>`,
+              }<div class="text small gt-word-break">${htmlEscape(issue.repository.full_name)}</div>`,
               value: issue.id,
             });
           });
@@ -178,9 +178,9 @@ export function initRepoIssueCommentDelete() {
           const idx = $conversationHolder.data('idx');
           const lineType = $conversationHolder.closest('tr').data('line-type');
           if (lineType === 'same') {
-            $(`[data-path="${path}"] .add-code-comment[data-idx="${idx}"]`).removeClass('invisible');
+            $(`[data-path="${path}"] .add-code-comment[data-idx="${idx}"]`).removeClass('gt-invisible');
           } else {
-            $(`[data-path="${path}"] .add-code-comment[data-side="${side}"][data-idx="${idx}"]`).removeClass('invisible');
+            $(`[data-path="${path}"] .add-code-comment[data-side="${side}"][data-idx="${idx}"]`).removeClass('gt-invisible');
           }
           $conversationHolder.remove();
         }
diff --git a/web_src/js/features/repo-legacy.js b/web_src/js/features/repo-legacy.js
index 3b25c3653..51edf0bd1 100644
--- a/web_src/js/features/repo-legacy.js
+++ b/web_src/js/features/repo-legacy.js
@@ -150,7 +150,7 @@ export function initRepoCommentForm() {
 
         if ($(this).hasClass('checked')) {
           $(this).removeClass('checked');
-          $(this).find('.octicon-check').addClass('invisible');
+          $(this).find('.octicon-check').addClass('gt-invisible');
           if (hasUpdateAction) {
             if (!($(this).data('id') in items)) {
               items[$(this).data('id')] = {
@@ -164,7 +164,7 @@ export function initRepoCommentForm() {
           }
         } else {
           $(this).addClass('checked');
-          $(this).find('.octicon-check').removeClass('invisible');
+          $(this).find('.octicon-check').removeClass('gt-invisible');
           if (hasUpdateAction) {
             if (!($(this).data('id') in items)) {
               items[$(this).data('id')] = {
@@ -215,7 +215,7 @@ export function initRepoCommentForm() {
 
       $(this).parent().find('.item').each(function () {
         $(this).removeClass('checked');
-        $(this).find('.octicon-check').addClass('invisible');
+        $(this).find('.octicon-check').addClass('gt-invisible');
       });
 
       if (selector === 'select-reviewers-modify' || selector === 'select-assignees-modify') {