update target objectives styles

Signed-off-by: Yi Liu <yi.liu@eclipse-foundation.org>

layouts/shortcodes/page/objectives.html

@@ -19,13 +19,13 @@
 <section class="row text-center">
   <div class="container">
     <div class="col-xs-24 col-sm-12 padding-10 match-height-item-by-row">
-      <div class="background-primary padding-20 min-100">
+      <div class="background-image-consistent padding-20 min-100 border-radius-15">
         <p><strong>openPASS</strong></p>
         <p>(open <strong>P</strong>latform for <strong>A</strong>ssessment of <strong>S</strong>afety <strong>S</strong>ystems)</p>
       </div>
     </div>
     <div class="col-xs-24 col-sm-12 padding-10 match-height-item-by-row">
-      <div class="background-primary padding-20 min-100 ">
+      <div class="background-image-consistent padding-20 min-100 border-radius-15">
         <p>High level of transparency and acceptance through publicly available open source platform.</p>
       </div> 
     </div>
@@ -36,7 +36,7 @@
 </figure>
 <section class="row text-center">
   <div class="col-xs-24 margin-bottom-20 padding-10 match-height-item-by-row">
-    <div class="background-secondary padding-20 min-100">
+    <div class="background-secondary padding-20 min-100 border-radius-15">
      <p>Harmonized and flexible platform for effectiveness assessment of advanced driver assistance systems and automated driving.</p>
     </div>
   </div>

less/_variables.less

@@ -11,4 +11,6 @@
  * SPDX-License-Identifier: EPL-2.0
 */
 
-@link-color: lighten(@brand-quaternary, 20%);
+@link-color: lighten(@brand-quaternary, 20%);
\ No newline at end of file
+
+@background-image-consistent: #cbd1dd;
\ No newline at end of file

less/styles.less

@@ -44,4 +44,15 @@
   h2 {
     font-weight: 300;
   }
+}
+
+.background-image-consistent {
+  background-color: @background-image-consistent;
+  p {
+    color: @black;
+  }
+}
+
+.border-radius-15 {
+  border-radius: 15px;
 }
\ No newline at end of file