diff --git a/nummi/main/static/main/css/plot.css b/nummi/main/static/main/css/plot.css
index 52dd617..0d1223c 100644
--- a/nummi/main/static/main/css/plot.css
+++ b/nummi/main/static/main/css/plot.css
@@ -102,3 +102,9 @@ table.full-width col.bar {
 .calendar .m {
   background: var(--red);
 }
+.calendar tbody tr:not(:last-child) {
+  border-bottom: none;
+}
+.calendar tbody tr:not(:first-child) {
+  border-top: none;
+}