Display continents filters buttons with countries only

Hide the ones with no linked country

src/style/organisms/_locations.scss

@@ -1,5 +1,5 @@
 .browse {
-    margin-top: 96px;
+    margin: 96px 0 128px;
 
     // Description
     &__description {
@@ -17,9 +17,12 @@
 
     // Continents
     &__continents {
+        display: flex;
+        justify-content: center;
         text-align: center;
 
-        button {
+        li {
+            display: block;
             margin: 0 8px;
         }
     }
@@ -28,7 +31,7 @@
     &__locations {
         width: 70%;
         max-width: 1200px;
-        margin: 88px auto 80px;
+        margin: 88px auto 0;
         padding: 0 32px;
 
         @include bp (mob-lg) {
@@ -43,7 +46,7 @@
             display: flex;
             flex-flow: row wrap;
             width: 100%;
-            margin: 104px auto 80px;
+            margin-top: 104px;
         }
 
         .location {