Update the visuals of about:flags "Relaunch Now" button.

chrome/browser/resources/flags.css

Index: chrome/browser/resources/flags.css
diff --git a/chrome/browser/resources/flags.css b/chrome/browser/resources/flags.css
index 5065b83a90a75f824d3b2bae9cdc90187c7fde22..c69ed920334c57fb92808bc7c32e663cc9792b89 100644
--- a/chrome/browser/resources/flags.css
+++ b/chrome/browser/resources/flags.css
@@ -7,8 +7,8 @@ body {
 <if expr="not is_android and not is_ios">
   min-width: 47em;
 </if>
-  /* Should match needs-restart.height + 5 */
-  padding-bottom: 75px;
+  /* Should be larger than the evaluated height of needs-restart. */
+  padding-bottom: 100px;
 }
 
 a {
@@ -164,14 +164,14 @@ html[dir=rtl] #experiment-reset-all {
 }
 
 div.needs-restart {
+  /* If you modify properties that change the height of this,
+   * update body.padding-bottom. */
   background: #FFF;
   border-top: 1px solid rgb(181, 199, 222);
   bottom: 0;
   box-sizing: border-box;
-  /* If you change this, update body.padding-bottom */
-  height: 70px;
   left: 0;
-  padding-bottom: 25px;
+  padding-bottom: 15px;
   padding-left: 15px;
   padding-right: 15px;
   padding-top: 15px;
@@ -179,6 +179,22 @@ div.needs-restart {
   width: 100%;
 }
 
+.experiment-restart-button {
+  -webkit-user-select: none;
+  background: rgb(76, 142, 250);
+  border: 0;
+  border-radius: 2px;
+  box-sizing: border-box;
+  color: #fff;
+  cursor: pointer;
+  font-size: .875em;
+  font-weight: 600;
+  margin-top: 10px;
+  padding: 10px 24px;
+  text-transform: uppercase;
+  transition: box-shadow 200ms cubic-bezier(0.4, 0, 0.2, 1);
+}
+
 button {
   font-size: 104%;
 }