Problems: fix nodata styles, closes #717

src/sass/_panel-problems.scss

@@ -69,6 +69,8 @@
 
     .rt-noData {
       z-index: 2;
+      background: unset;
+      color: $text-muted;
     }
 
     .pagination-bottom {
@@ -522,15 +524,22 @@
 
   @for $i from 11 through 25 {
     .item-#{$i} { width: 2em * $i; }
-    &.font-size--#{$i * 10} .rt-table {
-      font-size: 1% * $i * 10;
+    &.font-size--#{$i * 10} {
+      .rt-table {
+        font-size: 1% * $i * 10;
 
-      & .rt-tr .rt-td.custom-expander i {
-        font-size: 1.2rem * $i / 10;
+        & .rt-tr .rt-td.custom-expander i {
+          font-size: 1.2rem * $i / 10;
+        }
+
+        .problem-details-container.show {
+          font-size: 13px;
+        }
       }
 
-      .problem-details-container.show {
-        font-size: 13px;
+      .rt-noData {
+        top: 4.5em;
+        font-size: 1% * $i * 10;
       }
     }
   }