Add spacing between items

Also fix padding not being respected when blocks exceed container
height.

src/browser/pages/global.css

 html,
 body,
-#root,
-.center-container {
+#root {
   height: 100%;
   width: 100%;
 }
@@ -39,7 +38,9 @@ button {
   display: flex;
   flex-direction: column;
   justify-content: center;
+  min-height: 100%;
   padding: 20px;
+  width: 100%;
 }
 
 .card-box {

src/browser/pages/home.css

@@ -4,6 +4,7 @@
 
 .block-row > .item {
   flex: 1;
+  margin: 2px 0;
 }
 
 .block-row > .item.-row {