diff --git a/.prettierrc b/.prettierrc
index b785842..0a72520 100644
--- a/.prettierrc
+++ b/.prettierrc
@@ -1,6 +1,6 @@
 {
-    "trailingComma": "es5",
-    "tabWidth": 2,
-    "semi": false,
-    "singleQuote": true
+  "trailingComma": "es5",
+  "tabWidth": 2,
+  "semi": true,
+  "singleQuote": true
 }
diff --git a/config.js b/config.js
index 87a7ab7..80f705b 100644
--- a/config.js
+++ b/config.js
@@ -1,52 +1,52 @@
-"use strict";
+'use strict';
 
 module.exports = {
-  url: "https://lumen.netlify.com",
-  pathPrefix: "/",
-  title: "Blog by John Doe",
+  url: 'https://lumen.netlify.com',
+  pathPrefix: '/',
+  title: 'Blog by John Doe',
   subtitle:
-    "Pellentesque odio nisi, euismod in, pharetra a, ultricies in, diam. Sed arcu.",
-  copyright: "© All rights reserved.",
-  disqusShortname: "",
+    'Pellentesque odio nisi, euismod in, pharetra a, ultricies in, diam. Sed arcu.',
+  copyright: '© All rights reserved.',
+  disqusShortname: '',
   postsPerPage: 4,
-  googleAnalyticsId: "UA-73379983-2",
+  googleAnalyticsId: 'UA-73379983-2',
   useKatex: false,
   menu: [
     {
-      label: "Articles",
-      path: "/",
+      label: 'Articles',
+      path: '/',
     },
     {
-      label: "About me",
-      path: "/pages/about",
+      label: 'About me',
+      path: '/pages/about',
     },
     {
-      label: "Contact me",
-      path: "/pages/contacts",
+      label: 'Contact me',
+      path: '/pages/contacts',
     },
   ],
   author: {
-    name: "John Doe",
-    photo: "/photo.jpg",
+    name: 'John Doe',
+    photo: '/photo.jpg',
     bio:
-      "Pellentesque odio nisi, euismod in, pharetra a, ultricies in, diam. Sed arcu.",
+      'Pellentesque odio nisi, euismod in, pharetra a, ultricies in, diam. Sed arcu.',
     contacts: {
-      email: "",
-      facebook: "#",
-      telegram: "#",
-      twitter: "#",
-      github: "#",
-      rss: "",
-      vkontakte: "",
-      linkedin: "#",
-      instagram: "#",
-      line: "",
-      gitlab: "",
-      weibo: "",
-      codepen: "",
-      youtube: "",
-      soundcloud: "",
-      medium: "#",
+      email: '',
+      facebook: '#',
+      telegram: '#',
+      twitter: '#',
+      github: '#',
+      rss: '',
+      vkontakte: '',
+      linkedin: '#',
+      instagram: '#',
+      line: '',
+      gitlab: '',
+      weibo: '',
+      codepen: '',
+      youtube: '',
+      soundcloud: '',
+      medium: '#',
     },
   },
 };
diff --git a/src/constants/icons.js b/src/constants/icons.js
index b1002a8..f05fcc1 100644
--- a/src/constants/icons.js
+++ b/src/constants/icons.js
@@ -80,6 +80,6 @@ const ICONS = {
       'M2.846 6.887a.928.928 0 00-.303-.784l-2.24-2.7V3h6.958l5.378 11.795L17.367 3H24v.403L22.084 5.24a.561.561 0 00-.213.538v13.498a.56.56 0 00.213.537l1.871 1.837v.403h-9.412v-.403l1.939-1.882c.19-.19.19-.246.19-.537V8.321l-5.389 13.688h-.728L4.28 8.321v9.174c-.052.385.076.774.347 1.052l2.521 3.058v.404H0v-.404l2.521-3.058c.27-.279.39-.67.325-1.052V6.887z',
     viewBox: '0 0 24 24',
   },
-}
+};
 
-export default ICONS
+export default ICONS;
diff --git a/src/hooks/use-site-metadata.js b/src/hooks/use-site-metadata.js
index 4ea4238..d247d8a 100644
--- a/src/hooks/use-site-metadata.js
+++ b/src/hooks/use-site-metadata.js
@@ -1,5 +1,5 @@
 // @flow strict
-import { useStaticQuery, graphql } from 'gatsby'
+import { useStaticQuery, graphql } from 'gatsby';
 
 const useSiteMetadata = () => {
   const { site } = useStaticQuery(
@@ -43,9 +43,9 @@ const useSiteMetadata = () => {
         }
       }
     `
-  )
+  );
 
-  return site.siteMetadata
-}
+  return site.siteMetadata;
+};
 
-export default useSiteMetadata
+export default useSiteMetadata;
diff --git a/src/utils/get-contact-href.js b/src/utils/get-contact-href.js
index 0adba18..b9fb6ed 100644
--- a/src/utils/get-contact-href.js
+++ b/src/utils/get-contact-href.js
@@ -1,59 +1,59 @@
 // @flow strict
 const getContactHref = (name: string, contact: string) => {
-  let href
+  let href;
 
   switch (name) {
     case 'twitter':
-      href = `https://www.twitter.com/${contact}`
-      break
+      href = `https://www.twitter.com/${contact}`;
+      break;
     case 'github':
-      href = `https://github.com/${contact}`
-      break
+      href = `https://github.com/${contact}`;
+      break;
     case 'vkontakte':
-      href = `https://vk.com/${contact}`
-      break
+      href = `https://vk.com/${contact}`;
+      break;
     case 'telegram':
-      href = `https://t.me/${contact}`
-      break
+      href = `https://t.me/${contact}`;
+      break;
     case 'email':
-      href = `mailto:${contact}`
-      break
+      href = `mailto:${contact}`;
+      break;
     case 'linkedin':
-      href = `https://www.linkedin.com/in/${contact}`
-      break
+      href = `https://www.linkedin.com/in/${contact}`;
+      break;
     case 'instagram':
-      href = `https://www.instagram.com/${contact}`
-      break
+      href = `https://www.instagram.com/${contact}`;
+      break;
     case 'line':
-      href = `line://ti/p/${contact}`
-      break
+      href = `line://ti/p/${contact}`;
+      break;
     case 'facebook':
-      href = `https://www.facebook.com/${contact}`
-      break
+      href = `https://www.facebook.com/${contact}`;
+      break;
     case 'gitlab':
-      href = `https://www.gitlab.com/${contact}`
-      break
+      href = `https://www.gitlab.com/${contact}`;
+      break;
     case 'weibo':
-      href = `https://www.weibo.com/${contact}`
-      break
+      href = `https://www.weibo.com/${contact}`;
+      break;
     case 'codepen':
-      href = `https://www.codepen.io/${contact}`
-      break
+      href = `https://www.codepen.io/${contact}`;
+      break;
     case 'youtube':
-      href = `https://www.youtube.com/channel/${contact}`
-      break
+      href = `https://www.youtube.com/channel/${contact}`;
+      break;
     case 'soundcloud':
-      href = `https://soundcloud.com/${contact}`
-      break
+      href = `https://soundcloud.com/${contact}`;
+      break;
     case 'medium':
-      href = `https://medium.com/${contact}`
-      break
+      href = `https://medium.com/${contact}`;
+      break;
     default:
-      href = contact
-      break
+      href = contact;
+      break;
   }
 
-  return href
-}
+  return href;
+};
 
-export default getContactHref
+export default getContactHref;
diff --git a/src/utils/get-contact-href.test.js b/src/utils/get-contact-href.test.js
index 975280e..a53c23c 100644
--- a/src/utils/get-contact-href.test.js
+++ b/src/utils/get-contact-href.test.js
@@ -1,23 +1,23 @@
 // @flow strict
-import getContactHref from './get-contact-href'
+import getContactHref from './get-contact-href';
 
 test('getContactHref', () => {
-  expect(getContactHref('twitter', '#')).toBe('https://www.twitter.com/#')
-  expect(getContactHref('github', '#')).toBe('https://github.com/#')
-  expect(getContactHref('email', '#')).toBe('mailto:#')
-  expect(getContactHref('vkontakte', '#')).toBe('https://vk.com/#')
-  expect(getContactHref('telegram', '#')).toBe('https://t.me/#')
-  expect(getContactHref('rss', '#')).toBe('#')
-  expect(getContactHref('linkedin', '#')).toBe('https://www.linkedin.com/in/#')
-  expect(getContactHref('instagram', '#')).toBe('https://www.instagram.com/#')
-  expect(getContactHref('line', '#')).toBe('line://ti/p/#')
-  expect(getContactHref('facebook', '#')).toBe('https://www.facebook.com/#')
-  expect(getContactHref('gitlab', '#')).toBe('https://www.gitlab.com/#')
-  expect(getContactHref('weibo', '#')).toBe('https://www.weibo.com/#')
-  expect(getContactHref('codepen', '#')).toBe('https://www.codepen.io/#')
+  expect(getContactHref('twitter', '#')).toBe('https://www.twitter.com/#');
+  expect(getContactHref('github', '#')).toBe('https://github.com/#');
+  expect(getContactHref('email', '#')).toBe('mailto:#');
+  expect(getContactHref('vkontakte', '#')).toBe('https://vk.com/#');
+  expect(getContactHref('telegram', '#')).toBe('https://t.me/#');
+  expect(getContactHref('rss', '#')).toBe('#');
+  expect(getContactHref('linkedin', '#')).toBe('https://www.linkedin.com/in/#');
+  expect(getContactHref('instagram', '#')).toBe('https://www.instagram.com/#');
+  expect(getContactHref('line', '#')).toBe('line://ti/p/#');
+  expect(getContactHref('facebook', '#')).toBe('https://www.facebook.com/#');
+  expect(getContactHref('gitlab', '#')).toBe('https://www.gitlab.com/#');
+  expect(getContactHref('weibo', '#')).toBe('https://www.weibo.com/#');
+  expect(getContactHref('codepen', '#')).toBe('https://www.codepen.io/#');
   expect(getContactHref('youtube', '#')).toBe(
     'https://www.youtube.com/channel/#'
-  )
-  expect(getContactHref('soundcloud', '#')).toBe('https://soundcloud.com/#')
-  expect(getContactHref('medium', '#')).toBe('https://medium.com/#')
-})
+  );
+  expect(getContactHref('soundcloud', '#')).toBe('https://soundcloud.com/#');
+  expect(getContactHref('medium', '#')).toBe('https://medium.com/#');
+});
diff --git a/src/utils/get-icon.js b/src/utils/get-icon.js
index c6262de..2b5631f 100644
--- a/src/utils/get-icon.js
+++ b/src/utils/get-icon.js
@@ -1,64 +1,64 @@
 // @flow strict
-import { ICONS } from '../constants'
+import { ICONS } from '../constants';
 
 const getIcon = (name: string) => {
-  let icon
+  let icon;
 
   switch (name) {
     case 'twitter':
-      icon = ICONS.TWITTER
-      break
+      icon = ICONS.TWITTER;
+      break;
     case 'github':
-      icon = ICONS.GITHUB
-      break
+      icon = ICONS.GITHUB;
+      break;
     case 'vkontakte':
-      icon = ICONS.VKONTAKTE
-      break
+      icon = ICONS.VKONTAKTE;
+      break;
     case 'telegram':
-      icon = ICONS.TELEGRAM
-      break
+      icon = ICONS.TELEGRAM;
+      break;
     case 'email':
-      icon = ICONS.EMAIL
-      break
+      icon = ICONS.EMAIL;
+      break;
     case 'rss':
-      icon = ICONS.RSS
-      break
+      icon = ICONS.RSS;
+      break;
     case 'linkedin':
-      icon = ICONS.LINKEDIN
-      break
+      icon = ICONS.LINKEDIN;
+      break;
     case 'instagram':
-      icon = ICONS.INSTAGRAM
-      break
+      icon = ICONS.INSTAGRAM;
+      break;
     case 'line':
-      icon = ICONS.LINE
-      break
+      icon = ICONS.LINE;
+      break;
     case 'facebook':
-      icon = ICONS.FACEBOOK
-      break
+      icon = ICONS.FACEBOOK;
+      break;
     case 'gitlab':
-      icon = ICONS.GITLAB
-      break
+      icon = ICONS.GITLAB;
+      break;
     case 'weibo':
-      icon = ICONS.WEIBO
-      break
+      icon = ICONS.WEIBO;
+      break;
     case 'codepen':
-      icon = ICONS.CODEPEN
-      break
+      icon = ICONS.CODEPEN;
+      break;
     case 'youtube':
-      icon = ICONS.YOUTUBE
-      break
+      icon = ICONS.YOUTUBE;
+      break;
     case 'soundcloud':
-      icon = ICONS.SOUNDCLOUD
-      break
+      icon = ICONS.SOUNDCLOUD;
+      break;
     case 'medium':
-      icon = ICONS.MEDIUM
-      break
+      icon = ICONS.MEDIUM;
+      break;
     default:
-      icon = {}
-      break
+      icon = {};
+      break;
   }
 
-  return icon
-}
+  return icon;
+};
 
-export default getIcon
+export default getIcon;
diff --git a/src/utils/get-icon.test.js b/src/utils/get-icon.test.js
index b2b0be9..9143bf6 100644
--- a/src/utils/get-icon.test.js
+++ b/src/utils/get-icon.test.js
@@ -1,22 +1,22 @@
 // @flow strict
-import getIcon from './get-icon'
-import { ICONS } from '../constants'
+import getIcon from './get-icon';
+import { ICONS } from '../constants';
 
 test('getIcon', () => {
-  expect(getIcon('twitter')).toBe(ICONS.TWITTER)
-  expect(getIcon('github')).toBe(ICONS.GITHUB)
-  expect(getIcon('vkontakte')).toBe(ICONS.VKONTAKTE)
-  expect(getIcon('telegram')).toEqual(ICONS.TELEGRAM)
-  expect(getIcon('email')).toEqual(ICONS.EMAIL)
-  expect(getIcon('rss')).toEqual(ICONS.RSS)
-  expect(getIcon('linkedin')).toEqual(ICONS.LINKEDIN)
-  expect(getIcon('instagram')).toEqual(ICONS.INSTAGRAM)
-  expect(getIcon('line')).toEqual(ICONS.LINE)
-  expect(getIcon('facebook')).toEqual(ICONS.FACEBOOK)
-  expect(getIcon('gitlab')).toEqual(ICONS.GITLAB)
-  expect(getIcon('weibo')).toEqual(ICONS.WEIBO)
-  expect(getIcon('codepen')).toEqual(ICONS.CODEPEN)
-  expect(getIcon('youtube')).toEqual(ICONS.YOUTUBE)
-  expect(getIcon('soundcloud')).toEqual(ICONS.SOUNDCLOUD)
-  expect(getIcon('medium')).toEqual(ICONS.MEDIUM)
-})
+  expect(getIcon('twitter')).toBe(ICONS.TWITTER);
+  expect(getIcon('github')).toBe(ICONS.GITHUB);
+  expect(getIcon('vkontakte')).toBe(ICONS.VKONTAKTE);
+  expect(getIcon('telegram')).toEqual(ICONS.TELEGRAM);
+  expect(getIcon('email')).toEqual(ICONS.EMAIL);
+  expect(getIcon('rss')).toEqual(ICONS.RSS);
+  expect(getIcon('linkedin')).toEqual(ICONS.LINKEDIN);
+  expect(getIcon('instagram')).toEqual(ICONS.INSTAGRAM);
+  expect(getIcon('line')).toEqual(ICONS.LINE);
+  expect(getIcon('facebook')).toEqual(ICONS.FACEBOOK);
+  expect(getIcon('gitlab')).toEqual(ICONS.GITLAB);
+  expect(getIcon('weibo')).toEqual(ICONS.WEIBO);
+  expect(getIcon('codepen')).toEqual(ICONS.CODEPEN);
+  expect(getIcon('youtube')).toEqual(ICONS.YOUTUBE);
+  expect(getIcon('soundcloud')).toEqual(ICONS.SOUNDCLOUD);
+  expect(getIcon('medium')).toEqual(ICONS.MEDIUM);
+});