Exclude trybots from horizontal_one_box_per_builder, fix CSS

master/public_html/default.css

 /*
 
 Skia-specific stylings for the buildbot pages
 
 This overrides the defaults set in:
 third_party/chromium_buildbot/third_party/buildbot_8_4p1/buildbot/status/web/files/default.css.
 
 */
 
 body.interface {
@@ skipping 24 matching lines @@
 
 .Project {
   min-width: 6em;
 }
 
 .LastBuild,.Activity {
   padding: 0 0 0 4px;
 }
 
 .LastBuild,.Activity,.Builder,.BuildStep {
-  min-width: 5em;
+  width: 155px;
+  max-width: 155px;
 }
 
 div.RoundedRect {
   border: 1px solid black;
   background-color: white;
   border-radius: 5px;
   -webkit-border-radius: 5px;
   -moz-border-radius: 5px;
   padding: 10px;
 }
@@ skipping 589 matching lines @@
   background-color: #8fdf5f;
 }
 
 div.closed {
   background-color: #e98080;
 }
 
 div.caution {
   background-color: #FFFC6C;
 }