Add block navigation buttons

src/Block.tsx

@@ -1,10 +1,16 @@
 import React, { useEffect, useState, useMemo } from "react";
 import { useParams, NavLink } from "react-router-dom";
 import { ethers, BigNumber } from "ethers";
+import { FontAwesomeIcon } from "@fortawesome/react-fontawesome";
+import {
+  faChevronLeft,
+  faChevronRight,
+} from "@fortawesome/free-solid-svg-icons";
 import { provider } from "./ethersconfig";
 import StandardFrame from "./StandardFrame";
 import StandardSubtitle from "./StandardSubtitle";
 import ContentFrame from "./ContentFrame";
+import NavButton from "./components/NavButton";
 import Timestamp from "./components/Timestamp";
 import GasValue from "./components/GasValue";
 import BlockLink from "./components/BlockLink";
@@ -101,9 +107,23 @@ const Block: React.FC = () => {
       {block && (
         <ContentFrame>
           <InfoRow title="Block Height">
-            <span className="font-bold">
+            <div className="flex space-x-1 items-baseline">
+              <span className="font-bold mr-1">
                 {ethers.utils.commify(block.number)}
               </span>
+              <NavButton
+                blockNum={block.number - 1}
+                disabled={block.number === 0}
+              >
+                <FontAwesomeIcon icon={faChevronLeft} />
+              </NavButton>
+              <NavButton
+                blockNum={block.number + 1}
+                disabled={block.number === 0}
+              >
+                <FontAwesomeIcon icon={faChevronRight} />
+              </NavButton>
+            </div>
           </InfoRow>
           <InfoRow title="Timestamp">
             <Timestamp value={block.timestamp} />

src/components/NavButton.tsx

@@ -0,0 +1,31 @@
+import { NavLink } from "react-router-dom";
+
+type NavButtonProps = {
+  blockNum: number;
+  disabled?: boolean;
+};
+
+const NavButton: React.FC<NavButtonProps> = ({
+  blockNum,
+  disabled,
+  children,
+}) => {
+  if (disabled) {
+    return (
+      <span className="bg-link-blue bg-opacity-10 text-gray-400 rounded px-2 py-1 text-xs">
+        {children}
+      </span>
+    );
+  }
+
+  return (
+    <NavLink
+      className="transition-colors bg-link-blue bg-opacity-10 text-link-blue hover:bg-opacity-100 hover:text-white disabled:bg-link-blue disabled:text-gray-400 disabled:cursor-default rounded px-2 py-1 text-xs"
+      to={`/block/${blockNum}`}
+    >
+      {children}
+    </NavLink>
+  );
+};
+
+export default NavButton;