diff --git a/backend/.plano.py b/backend/.plano.py
index 5124d5e..eab95d3 100644
--- a/backend/.plano.py
+++ b/backend/.plano.py
@@ -25,7 +25,7 @@
 def build(no_cache=False):
     no_cache_arg = "--no-cache" if no_cache else ""
 
-    run(f"podman build {no_cache_arg} -t {image_tag} .")
+    run(f"podman build {no_cache_arg} --format docker -t {image_tag} .")
 
 @command
 def run_():
diff --git a/frontend/.plano.py b/frontend/.plano.py
index f8b38a4..7a7571a 100644
--- a/frontend/.plano.py
+++ b/frontend/.plano.py
@@ -26,7 +26,7 @@
 def build(no_cache=False):
     no_cache_arg = "--no-cache" if no_cache else ""
 
-    run(f"podman build {no_cache_arg} -t {image_tag} .")
+    run(f"podman build {no_cache_arg} --format docker -t {image_tag} .")
 
 @command
 def run_():
diff --git a/frontend/python/main.py b/frontend/python/main.py
index 4f4832b..a56eeb4 100644
--- a/frontend/python/main.py
+++ b/frontend/python/main.py
@@ -25,7 +25,7 @@
 import uvicorn
 
 from animalid import generate_animal_id
-from httpx import AsyncClient
+from httpx import AsyncClient, HTTPError
 from sse_starlette.sse import EventSourceResponse
 from starlette.applications import Starlette
 from starlette.responses import FileResponse, JSONResponse, Response
@@ -73,11 +73,15 @@ async def generate_id(request):
 async def hello(request):
     request_data = await request.json()
 
-    backend_request, backend_response = await send_greeting(request_data["name"], request_data["text"])
+    name = request_data["name"]
+    text = request_data["text"]
+
+    backend_request, backend_response, backend_error = await send_greeting(name, text)
 
     record = {
         "request": backend_request,
         "response": backend_response,
+        "error": backend_error,
     }
 
     records.append(record);
@@ -94,11 +98,14 @@ async def send_greeting(name, text):
     }
 
     async with AsyncClient() as client:
-        response = await client.post(f"{backend_url}/api/hello", json=request_data)
+        try:
+            response = await client.post(f"{backend_url}/api/hello", json=request_data)
+        except HTTPError as e:
+            return request_data, None, str(e)
 
     response_data = response.json()
 
-    return request_data, response_data
+    return request_data, response_data, None
 
 @star.route("/api/health", methods=["GET"])
 async def health(request):
diff --git a/frontend/static/gesso/general.css b/frontend/static/gesso/general.css
index f4b3abd..da09394 100644
--- a/frontend/static/gesso/general.css
+++ b/frontend/static/gesso/general.css
@@ -1,4 +1,4 @@
-@import url("https://fonts.googleapis.com/css2?family=Source+Sans+Pro:ital,wght@0,300;0,400;0,600;0,700;1,300;1,400;1,600;1,700&display=swap");
+@import url('https://fonts.googleapis.com/css2?family=Source+Sans+3:ital,wght@0,400;0,500;0,600;1,400;1,500;1,600&display=swap');
 @import url("https://fonts.googleapis.com/icon?family=Material+Icons+Outlined");
 
 :root {
@@ -32,7 +32,7 @@ br {
 }
 
 body {
-    font: 13pt/19pt "Source Sans Pro", sans-serif;
+    font: 13pt/19pt "Source Sans 3", sans-serif;
     font-weight: 400;
     color: var(--black);
     margin: 0;
@@ -57,5 +57,9 @@ h2 {
 }
 
 h1, h2, h3, h4, th, b {
+    font-weight: 500;
+}
+
+b {
     font-weight: 600;
 }
diff --git a/frontend/static/gesso/gesso.js b/frontend/static/gesso/gesso.js
index d0faad3..304ee87 100644
--- a/frontend/static/gesso/gesso.js
+++ b/frontend/static/gesso/gesso.js
@@ -251,7 +251,7 @@ export function formatBoolean(value) {
     else return "No";
 }
 
-export function getJson(url, handler) {
+export function getJson(url, responseDataHandler, errorHandler) {
     console.log("Getting data from", url);
 
     fetch(url, {
@@ -260,16 +260,20 @@ export function getJson(url, handler) {
     })
         .then(response => response.json())
         .then(responseData => {
-            if (handler) {
-                handler(responseData);
+            if (responseDataHandler) {
+                responseDataHandler(responseData);
             }
         })
         .catch(error => {
-            console.log(error);
+            if (errorHandler) {
+                errorHandler(error);
+            } else {
+                console.log(error);
+            }
         });
 }
 
-export function postJson(url, requestData, handler) {
+export function postJson(url, requestData, responseDataHandler, errorHandler) {
     console.log("Posting data to", url);
 
     fetch(url, {
@@ -279,12 +283,16 @@ export function postJson(url, requestData, handler) {
     })
         .then(response => response.json())
         .then(responseData => {
-            if (handler) {
-                handler(responseData)
+            if (responseDataHandler) {
+                responseDataHandler(responseData)
             }
         })
         .catch(error => {
-            console.log(error);
+            if (errorHandler) {
+                errorHandler(error);
+            } else {
+                console.log(error);
+            }
         });
 }
 
@@ -374,8 +382,8 @@ export class Router {
     }
 }
 
-// One column: [title string, data key, optional rendering function]
-// Rendering function: render(value, item, context) => value
+// One column: [columnTitle, recordKey, cellRenderFunction (optional)]
+// cellRenderFunction: render(record, recordKey, context) => value or elem
 // Context is whatever the user chooses to pass into update()
 export class Table {
     constructor(id, columns) {
@@ -383,7 +391,7 @@ export class Table {
         this.columns = columns;
     }
 
-    update(items, context) {
+    update(records, context) {
         const headings = [];
         const rows = [];
         const div = createDiv(null, `#${this.id}`);
@@ -392,17 +400,18 @@ export class Table {
             headings.push(column[0]);
         }
 
-        for (const item of items) {
+        for (const record of records) {
             const row = [];
 
             for (const column of this.columns) {
-                let value = item[column[1]];
+                const recordKey = column[1];
+                const cellRenderFunction = column[2];
 
-                if (column.length === 3) {
-                    value = column[2](value, item, context);
+                if (cellRenderFunction) {
+                    row.push(cellRenderFunction(record, recordKey, context));
+                } else {
+                    row.push(record[recordKey]);
                 }
-
-                row.push(value);
             }
 
             rows.push(row);
diff --git a/frontend/static/gesso/tables.css b/frontend/static/gesso/tables.css
index 1668a43..fbce805 100644
--- a/frontend/static/gesso/tables.css
+++ b/frontend/static/gesso/tables.css
@@ -2,7 +2,11 @@ table {
     width: 100%;
 }
 
-table th,
-table td {
+th,
+td {
     text-align: left;
 }
+
+th {
+    padding-bottom: 0.4em;
+}
diff --git a/frontend/static/main.css b/frontend/static/main.css
index da93a16..a462901 100644
--- a/frontend/static/main.css
+++ b/frontend/static/main.css
@@ -1 +1,10 @@
 @import url("./gesso/gesso.css");
+
+span.name {
+    font-weight: 600;
+}
+
+span.error {
+    font-weight: 500;
+    color: red;
+}
diff --git a/frontend/static/main.js b/frontend/static/main.js
index 9e89e16..a53577c 100644
--- a/frontend/static/main.js
+++ b/frontend/static/main.js
@@ -12,7 +12,7 @@ const html = `
   </header>
   <section>
     <div>
-      <div>Your name is <b id="name"></b>.</div>
+      <div>Your name is <span id="name" class="name"></span>.</div>
 
       <form id="hello-form" style="margin-bottom: 2em;">
         <div class="form-field">
@@ -28,25 +28,29 @@ const html = `
 </body>
 `;
 
-function renderRequest(value, item, context) {
+function renderRequest(record, recordKey, context) {
     const elem = gesso.createElement(null, "div");
 
-    elem.innerHTML = item.request.text.replace(item.request.name, `<b>${item.request.name}</b>`);
+    elem.innerHTML = record.request.text.replace(record.request.name, `<span class="name">${record.request.name}</span>`);
 
     return elem;
 }
 
-function renderResponse(value, item, context) {
+function renderResponse(record, recordKey, context) {
     const elem = gesso.createElement(null, "div");
 
-    elem.innerHTML = item.response.text.replace(item.response.name, `<b>${item.response.name}</b>`);
+    if (record.error) {
+        elem.innerHTML = `<span class="error">Error: ${record.error}</span>`;
+    } else {
+        elem.innerHTML = record.response.text.replace(record.response.name, `<span class="name">${record.response.name}</span>`);
+    }
 
     return elem;
 }
 
 const helloTable = new gesso.Table("hello-table", [
-    ["Frontend requests", "request", renderRequest],
-    ["Backend responses", "response", renderResponse],
+    ["Frontend", "request", renderRequest],
+    ["Backend", "response", renderResponse],
 ]);
 
 class MainPage extends gesso.Page {
@@ -81,10 +85,10 @@ class MainPage extends gesso.Page {
     updateContent() {
         $("#name").textContent = this.name;
 
-        gesso.getJson("/api/data", data => {
-            const responses = Object.values(data).reverse();
+        gesso.getJson("/api/data", responseData => {
+            const responses = Object.values(responseData).reverse();
 
-            helloTable.update(responses, data);
+            helloTable.update(responses, responseData);
         });
     }
 }