code review by liangzhifeng

@@ -51,7 +51,7 @@
                     width: 23%;
                     position: absolute;
                     left: 0;
-                    top: 50%; 
+                    top: 50%;
                     @include transform(translateY(-50%))
                 }
                 .material-desc {
@@ -109,6 +109,13 @@
                 width: pxToRem(581px);
                 height:auto;
             }
+
+            a {
+                color: #2f91f6;
+                text-decoration: underline;
+
+            }
+
         }
         margin-top: pxToRem(30px);
         margin-bottom: pxToRem(30px);