style: fix display of the PR graph of changesets available for update

88ce09daea37 dropped explicit html styling - fix it by adding css styling.

kallithea/public/css/style.css

@@ -1606,6 +1606,15 b' tr.out-of-range > td.mid .message > a {'
     text-decoration: none;
 }
 
+#updaterevs-graph {
+    position: absolute;
+    width: 40px;
+}
+
+#updaterevs-table {
+    margin-left: 40px !important;
+}
+
 #compare_branches + div.panel-body .revision-link,
 #compare_tags + div.panel-body .revision-link,
 #compare_bookmarks + div.panel-body .revision-link,

kallithea/templates/pullrequests/pullrequest_show.html

@@ -150,7 +150,7 b''
               <div class="msg-div">${c.update_msg}</div>
               %if c.avail_revs:
               <div id="updaterevs" class="clearfix">
-                <div>
+                <div id="updaterevs-graph">
                   <canvas id="avail_graph_canvas"></canvas>
                 </div>
                 <table class="table" id="updaterevs-table">