DSC-2715 Updated background color and made the border full width

(cherry picked from commit 2c1353428f810fa92e42cd27be5d7ac7b0923042)

Author: Mattia Vianelli

src/app/submission/submission-legend/submission-legend.component.scss

@@ -4,12 +4,11 @@
 }
 
 p {
-  display: inline-block;
   margin: 0;
   padding: 0.75rem 1rem;
   border: 1px solid #dee2e6;
   border-radius: 0.25rem;
-  background-color: #fff;
+  background-color: rgba(0, 0, 0, 0.03);
   font-size: 0.875rem;
   color: #212529;
 }