--- a/toolkit/content/aboutTelemetry.css
+++ b/toolkit/content/aboutTelemetry.css
@@ -223,25 +223,24 @@ body[dir="rtl"] .histogram {
   text-overflow: ellipsis;
   width: 100%;
   white-space: nowrap;
   overflow: hidden;
 }
 
 .keyed-histogram {
   white-space: nowrap;
-  padding: 15px;
   position: relative; /* required for position:absolute of the contained .copy-node */
   overflow: hidden;
 }
 
 .keyed-histogram-title {
   text-overflow: ellipsis;
   width: 100%;
-  margin: 10px;
+  margin: 12px 0;
   font-weight: bold;
   font-size: 120%;
   white-space: nowrap;
 }
 
 .bar {
   width: 2em;
   margin: 2px;
@@ -290,20 +289,19 @@ th {
   padding-bottom: 0.5em;
 }
 
 body[dir="rtl"] th {
   text-align: right;
 }
 
 caption {
-  font-weight: bold;
-  white-space: nowrap;
   text-align: left;
-  font-size: large;
+  font-size: xx-large;
+  margin: 1em 0 0.5em 0;
 }
 
 body[dir="rtl"] caption {
   text-align: right;
 }
 
 .copy-node {
   visibility: hidden;
@@ -318,13 +316,8 @@ body[dir="rtl"] .copy-node {
 
 .histogram:hover .copy-node {
   visibility: visible;
 }
 
 #raw-ping-data {
   font-size: 15px;
 }
-
-caption {
-  font-size: larger;
-  margin: 5px 0;
-}
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