fix student and contributor index tables and bottom border for "add another"

evap/static/scss/_adjustments.scss

@@ -84,6 +84,11 @@ body, .fixed-top, .fixed-bottom, .is-fixed, .sticky-top {
     border-bottom-left-radius: 0;
 }
 
+// remove horizontal line after "add another" in formsets
+.dynamic-form-add td {
+    border-bottom: none;
+}
+
 
 // select2 adjustments
 .select2-container--default .select2-selection--single {

evap/static/scss/_variables.scss

@@ -32,6 +32,7 @@ $headings-margin-bottom: 1rem;
 $table-accent-bg: transparent;
 $table-striped-bg: tint-color($light-gray, 50%);
 $table-border-color: $light-gray;
+$table-group-separator-color: $medium-gray;
 
 $card-cap-bg: $table-striped-bg;
 

evap/static/scss/components/_tables.scss

@@ -112,6 +112,13 @@
     height: 2.5rem;
 }
 
+tr.heading-row td {
+    border-bottom: none;
+}
+tr.heading-row:not(:first-child) td {
+    border-top: 1px solid $light-gray;
+}
+
 tr.heading-row.course-row {
     td {
         padding-bottom: 0.2rem;
@@ -154,6 +161,6 @@ tr.evaluation-row:not(.heading-row) {
     }
 }
 
-.table-headerless tr:first-child td {
-    border-top-width: 0;
+.table-headerless tr:last-child td {
+    border-bottom-width: 0;
 }