[CSS] Fix issue with column layout

Change-Id: I51666b41957e7793b2670b08fc465094b42ce4c4

gitiles-servlet/src/main/resources/com/google/gitiles/static/doc.css

diff --git a/gitiles-servlet/src/main/resources/com/google/gitiles/static/doc.css b/gitiles-servlet/src/main/resources/com/google/gitiles/static/doc.css
index 464e8a6..ca35407 100644
--- a/gitiles-servlet/src/main/resources/com/google/gitiles/static/doc.css
+++ b/gitiles-servlet/src/main/resources/com/google/gitiles/static/doc.css
@@ -230,14 +230,11 @@
 .aside p:last-child {
   margin-bottom: 0;
 }
-.cols {
-  margin: 0 -1.533%;
-  width: 103.067%;
-}
 .col-1, .col-2, .col-3, .col-4, .col-5, .col-6,
 .col-7, .col-8, .col-9, .col-10, .col-11, .col-12 {
-  float: left;
-  margin: 0 1.488% 20px;
+  display: inline-block;
+  margin-bottom: 20px;
+  vertical-align: top;
 }
 .col-1 { width: 5.357%; }
 .col-2 { width: 13.690%; }