Make PEM debugging section fixed width in the SSL interstitial

components/security_interstitials/core/browser/resources/interstitial_v2.css

 /* Copyright 2014 The Chromium Authors. All rights reserved.
    Use of this source code is governed by a BSD-style license that can be
    found in the LICENSE file. */
 
 a {
   color: #585858;
 }
 
 .bad-clock .icon {
   background-image: -webkit-image-set(
@@ skipping 43 matching lines @@
   display: inline;
   overflow: auto;
 }
 
 .debugging-content {
   line-height: 1em;
   margin-bottom: 0;
   margin-top: 1em;
 }
 
+.debugging-content-pem {
+  font-family: monospace;
+  display: block;
+}
+
 .debugging-title {
   font-weight: bold;
 }
 
 #details {
   color: #696969;
   margin: 45px 0 50px;
 }
 
 #details p:not(:first-of-type) {
@@ skipping 565 matching lines @@
     width: 100%;
   }
 }
 
 @media (max-width: 239px) and (orientation: portrait) {
   .nav-wrapper {
     padding-left: 0;
     padding-right: 0;
   }
 }