Improve readability of environments table

app/assets/javascripts/environments/components/environment.js.es6

@@ -211,12 +211,12 @@
             <table class="table ci-table environments">
               <thead>
                 <tr>
-                  <th>Environment</th>
-                  <th>Last deployment</th>
-                  <th>Build</th>
-                  <th>Commit</th>
-                  <th></th>
-                  <th class="hidden-xs"></th>
+                  <th class="environments-name">Environment</th>
+                  <th class="environments-deploy">Last deployment</th>
+                  <th class="environments-build">Build</th>
+                  <th class="environments-commit">Commit</th>
+                  <th class="environments-date"></th>
+                  <th class="hidden-xs environments-actions"></th>
                 </tr>
               </thead>
               <tbody>

app/assets/stylesheets/pages/environments.scss

@@ -18,6 +18,21 @@
 .environments {
   table-layout: fixed;
 
+  .environments-commit
+  .environments-actions {
+    width: 20%;
+  }
+
+  .environments-deploy,
+  .environments-build,
+  .environments-date {
+    width: 10%;
+  }
+
+  .environments-name {
+    width: 30%;
+  }
+
   .deployment-column {
     .avatar {
       float: none;