Allow script insets to scroll.

runtime/observatory/lib/src/elements/script_inset.html

Index: runtime/observatory/lib/src/elements/script_inset.html
diff --git a/runtime/observatory/lib/src/elements/script_inset.html b/runtime/observatory/lib/src/elements/script_inset.html
index 167816dc61157a8e5eb34686eaed45b8f5fb93f8..b3f6cd592b23fca37f6304740f6f0aa1ac02d24d 100644
--- a/runtime/observatory/lib/src/elements/script_inset.html
+++ b/runtime/observatory/lib/src/elements/script_inset.html
@@ -14,24 +14,24 @@
       .sourceInset {
       }
       .sourceTable {
-        display: table;
         background-color: #f5f5f5;
         border: 1px solid #ccc;
         padding: 10px;
         width: 100%;
         box-sizing: border-box;
+        overflow-x: scroll;
       }
       .sourceRow {
-        display: table-row;
+        display: flex;
+        flex-direction: row;
+        width: 100%;
       }
       .sourceItem, .sourceItemCurrent {
-        display: table-cell;
         vertical-align: top;
         font: 400 14px consolas, courier, monospace;
         line-height: 125%;
         white-space: pre;
         max-width: 0;
-	overflow-x: hidden;
       }
       .currentLine {
         background-color: #fff;
@@ -43,7 +43,8 @@
         display: table-cell;
         vertical-align: top;
         font: 400 14px consolas, courier, monospace;
-        width: 4em;
+        margin-left: 5px;
+        margin-right: 5px;
         text-align: right;
         color: #a8a8a8;
       }