Improve CSS to handle not having actions

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

@@ -155,7 +155,7 @@ module.exports = {
           </div>
         </section>
 
-        <section class="deploy-board-actions">
+        <section class="deploy-board-actions" v-if="deployBoardData.rollback_url || deployBoardData.abort_url">
           <a class="btn"
             data-method="post"
             rel="nofollow"

app/assets/stylesheets/pages/environments.scss

@@ -158,7 +158,7 @@
     width: 70px;
     flex-wrap: wrap;
     justify-content: center;
-    margin: 20px 0 20px 10px;
+    margin: 20px 0 20px 5px;
 
     > span {
       text-align: center;
@@ -175,7 +175,7 @@
 
   .deploy-board-instances {
     order: 2;
-    width: 75%;
+    margin-left: 20px;
 
     .text {
       color: $gl-text-color-secondary;
@@ -193,6 +193,8 @@
   .deploy-board-actions {
     order: 3;
     align-self: center;
+    min-width: 150px;
+    margin-left: 10px;
   }
 
   &.deploy-board-error-message {