feat: improve

templates/status/404.tmpl

@@ -2,7 +2,7 @@
 {{if .IsRepo}}<div class="repository">{{template "repo/header" .}}</div>{{end}}
 <div class="ui container center" style="background:url({{StaticUrlPrefix}}/img/404.png) no-repeat center center fixed;margin-bottom:-80px;height: 100%;width:100%;overflow: hidden;background-size: cover;">
 	<div style="height:100%;color:white">
-		<div style="padding-bottom: 80px">
+		<div style="padding-top: 50vh">
 			<div class="ui divider"></div>
 			<br>
 			<p>{{.i18n.Tr "error404" | Safe}}