Fixed isolate-shared-summary layout problems

runtime/observatory/lib/src/elements/css/shared.css

Index: runtime/observatory/lib/src/elements/css/shared.css
diff --git a/runtime/observatory/lib/src/elements/css/shared.css b/runtime/observatory/lib/src/elements/css/shared.css
index 51db1ff931dff0f2600455674906183755cfb329..7fec76fe6fb2e0568bff064859276647934ebc49 100644
--- a/runtime/observatory/lib/src/elements/css/shared.css
+++ b/runtime/observatory/lib/src/elements/css/shared.css
@@ -1063,6 +1063,8 @@ to isolate-shared-summary when wrapper removed */
 isolate-shared-summary,
 isolate-shared-summary-wrapped {
   display: block;
+}
+isolate-shared-summary-wrapped > .summary {
   height: 300px;
   position: relative;
 }