Merge pull request 'feat: fix the bug for z-index' (#139) from fix-ui into develop

Reviewed-by: yuyuanshifu <747342561@qq.com>
Reviewed-by: 林嘉怡 <2441898885@qq.com>

templates/repo/settings/collaboration.tmpl

@@ -38,7 +38,7 @@
 			{{end}}
 		</div>
 		{{end}}
-		<div class="ui bottom attached segment">
+		<div class="ui bottom attached segment" style="z-index:-1">
 			<form class="ui form" id="repo-collab-form" action="{{.Link}}" method="post">
 				{{.CsrfTokenHtml}}
 				<div class="inline field ui left">
@@ -89,7 +89,7 @@
 			{{end}}
 		</div>
 		{{end}}
-		<div class="ui bottom attached segment">
+		<div class="ui bottom attached segment" style="z-index:-1">
 			{{if $allowedToChangeTeams}}
 				<form class="ui form" id="repo-collab-team-form" action="{{.Link}}/team" method="post">
 					{{.CsrfTokenHtml}}