fix(ui) : center checkboxes and adjust collapse border color

src/app/shared/components/checkbox/checkbox.component.scss

@@ -9,7 +9,7 @@ input {
   border: 1px solid $grey-1;
   cursor: pointer;
   // Shift the checkbox down 1px to align with the text
-  transform: translateY(1px);
+  transform: translateY(2px);
 
   &.medium {
     width: 24px;

src/app/shared/components/collapse/collapse.component.scss

@@ -22,7 +22,7 @@
       box-shadow: 0px 12px 24px 0px rgba(0, 0, 0, 0.1);
     }
     &:not(.collapse-warning) {
-      border: 1px solid $grey-1;
+      border: 1px solid $grey-4;
     }
   }
 }