Use Link tag, instead of anchor tag

src/web-check-live/components/Form/Nav.tsx

@@ -1,5 +1,6 @@
 import styled from '@emotion/styled';
 import type { ReactNode } from 'react';
+import { Link } from 'react-router-dom';
 
 import { StyledCard } from 'web-check-live/components/Form/Card';
 import Heading from 'web-check-live/components/Form/Heading';
@@ -21,7 +22,7 @@ const Nav = (props: { children?: ReactNode}) => {
     <Header as="header">
     <Heading color={colors.primary} size="large">
       <img width="64" src="/web-check.png" alt="Web Check Icon" />
-      <a href="/">Web Check</a>
+      <Link to="/check">Web Check</Link>
     </Heading>
       {props.children && props.children}
   </Header>

src/web-check-live/components/boundaries/PageError.tsx

@@ -0,0 +1,132 @@
+import React from 'react';
+import styled from '@emotion/styled';
+
+import colors from 'web-check-live/styles/colors';
+import Heading from 'web-check-live/components/Form/Heading';
+import Footer from 'web-check-live/components/misc/Footer';
+import Nav from 'web-check-live/components/Form/Nav';
+import Button from 'web-check-live/components/Form/Button';
+import { StyledCard } from 'web-check-live/components/Form/Card';
+import { Link } from 'react-router-dom';
+
+interface ErrorBoundaryState {
+  hasError: boolean;
+  errorCount: number;
+  errorMessage: string | null;
+}
+
+interface ErrorBoundaryProps {
+  children: React.ReactNode;
+}
+
+const ErrorPageContainer = styled.div`
+width: 95vw;
+max-width: 1000px;
+margin: 2rem auto;
+padding-bottom: 1rem;
+header {
+  margin 1rem 0;
+  width: auto;
+}
+section {
+  width: auto;
+  .inner-heading { display: none; }
+}
+`;
+
+const HeaderLinkContainer = styled.nav`
+  display: flex;
+  flex-wrap: wrap;
+  gap: 1rem;
+  a {
+    text-decoration: none;
+  }
+`;
+
+const ErrorInner = styled(StyledCard)`
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  gap: 0.5rem;
+  h3 { font-size: 6rem; }
+`;
+
+const ErrorDetails = styled.div`
+  background: ${colors.primaryTransparent};
+  padding: 1rem;
+  border-radius: 0.5rem;
+`;
+
+const ErrorMessageText = styled.p`
+  color: ${colors.danger};
+`;
+
+class ErrorBoundary extends React.Component<ErrorBoundaryProps, ErrorBoundaryState> {
+  constructor(props: ErrorBoundaryProps) {
+    super(props);
+    this.state = { hasError: false, errorCount: 0, errorMessage: null };
+  }
+
+  static getDerivedStateFromError(err: Error): ErrorBoundaryState {
+    return { hasError: true, errorCount: 0, errorMessage: err.message };
+  }
+  
+
+  componentDidCatch(error: Error, errorInfo: React.ErrorInfo) {
+    console.error("Uncaught error:", error, errorInfo);
+    console.error(
+      `%cCritical Error%c\n\nRoute or component failed to mount%c:%c\n`
+      +`${this.state.errorCount < 1? 'Will attempt a page reload' : ''}. `
+      + `Error Details:\n${error}\n\n${JSON.stringify(errorInfo || {})}`,
+      `background: ${colors.danger}; color:${colors.background}; padding: 4px 8px; font-size: 16px;`,
+      `font-weight: bold; color: ${colors.danger};`,
+      `color: ${colors.danger};`,
+      `color: ${colors.warning};`,
+    );
+    if (this.state.errorCount < 1) {
+      this.setState(prevState => ({ errorCount: prevState.errorCount + 1 }));
+      window.location.reload();
+    }
+  }
+
+  render() {
+    if (this.state.hasError) {
+      return (
+        <ErrorPageContainer>
+          <Nav>
+            <HeaderLinkContainer>
+              <Link to="/"><Button>Go back Home</Button></Link>
+              <a target="_blank" rel="noreferrer" href="https://github.com/lissy93/web-check"><Button>View on GitHub</Button></a>
+            </HeaderLinkContainer>
+          </Nav>
+          <ErrorInner>
+            <Heading as="h1" size="medium" color={colors.primary}>Something's gone wrong</Heading>
+            <Heading as="h2" size="small" color={colors.textColor}>An unexpected error occurred.</Heading>
+            <Heading as="h3" size="large" color={colors.textColor}>🤯</Heading>
+            <ErrorDetails>
+              <p>
+                We're sorry this happened.
+                Usually reloading the page will resolve this, but if it doesn't, please raise a bug report.
+              </p>
+              {this.state.errorMessage && (
+              <p>
+                Below is the error message we received:<br /><br />
+                <ErrorMessageText>{this.state.errorMessage}</ErrorMessageText>
+              </p>
+              )}
+            </ErrorDetails>
+            <Button onClick={() => window.location.reload()}>Reload Page</Button>
+            <a target="_blank" rel="noreferrer" href="github.com/lissy93/web-check/issues/choose">
+              Report Issue
+            </a>
+          </ErrorInner>
+          <Footer isFixed={true} />
+        </ErrorPageContainer>
+      );
+    }
+
+    return this.props.children;
+  }
+}
+
+export default ErrorBoundary;

src/web-check-live/components/misc/Footer.tsx

@@ -1,4 +1,5 @@
 import styled from '@emotion/styled';
+import { Link } from 'react-router-dom';
 import colors from 'web-check-live/styles/colors';
 
 const StyledFooter = styled.footer`
@@ -27,7 +28,7 @@ const StyledFooter = styled.footer`
 `;
 
 
-const Link = styled.a`
+const ALink = styled.a`
   color: ${colors.primary};
   font-weight: bold;
   border-radius: 4px;
@@ -47,12 +48,12 @@ const Footer = (props: { isFixed?: boolean }): JSX.Element => {
   return (
   <StyledFooter style={props.isFixed ? {position: 'fixed'} : {}}>
     <span>
-      View source at <Link href={githubUrl}>github.com/lissy93/web-check</Link>
+      View source at <ALink href={githubUrl}>github.com/lissy93/web-check</ALink>
     </span>
     <span>
-      <Link href="/check/about">Web-Check</Link> is
-      licensed under <Link href={licenseUrl}>MIT</Link> -
-      © <Link href={authorUrl}>Alicia Sykes</Link> 2023
+      <Link to="/check/about">Web-Check</Link> is
+      licensed under <ALink href={licenseUrl}>MIT</ALink> -
+      © <ALink href={authorUrl}>Alicia Sykes</ALink> 2023
     </span>
   </StyledFooter>
   );

src/web-check-live/components/misc/Loader.tsx

@@ -44,8 +44,8 @@ const StyledSvg = styled.svg`
   margin: 0 auto;
   path {
     fill: ${colors.primary};
-    &:nth-child(2) { opacity: 0.8; }
-    &:nth-child(3) { opacity: 0.5; }
+    &:nth-of-type(2) { opacity: 0.8; }
+    &:nth-of-type(3) { opacity: 0.5; }
   }
 `;