diff --git a/website/blog/2021-08-30-a-glimpse-into-front-end-interviews.md b/website/blog/2021-08-30-a-glimpse-into-front-end-interviews.md
index b454ea7d..268c7100 100644
--- a/website/blog/2021-08-30-a-glimpse-into-front-end-interviews.md
+++ b/website/blog/2021-08-30-a-glimpse-into-front-end-interviews.md
@@ -2,7 +2,7 @@
 title: A Glimpse into Front End Interviews
 slug: a-glimpse-into-front-end-interviews
 author: Kai Li
-author_title: Software Engineer at Quora
+author_title: Software Engineer at Stripe, ex-Quora
 author_url: https://github.com/li-kai
 author_image_url: https://github.com/li-kai.png
 tags: [front end, leetcode]
diff --git a/website/docusaurus.config.js b/website/docusaurus.config.js
index 7c653022..f5188707 100755
--- a/website/docusaurus.config.js
+++ b/website/docusaurus.config.js
@@ -49,26 +49,39 @@ module.exports = {
         {
           href: 'https://github.com/yangshun/tech-interview-handbook',
           position: 'right',
-          className: 'navbar-icon navbar-icon-github',
+          className: 'navbar-icon',
           'aria-label': 'GitHub repository',
+          html: `<svg
+              stroke="currentColor"
+              fill="currentColor"
+              stroke-width="0"
+              viewBox="0 0 496 512"
+              height="24"
+              width="24"
+              xmlns="http://www.w3.org/2000/svg">
+              <path d="M165.9 397.4c0 2-2.3 3.6-5.2 3.6-3.3.3-5.6-1.3-5.6-3.6 0-2 2.3-3.6 5.2-3.6 3-.3 5.6 1.3 5.6 3.6zm-31.1-4.5c-.7 2 1.3 4.3 4.3 4.9 2.6 1 5.6 0 6.2-2s-1.3-4.3-4.3-5.2c-2.6-.7-5.5.3-6.2 2.3zm44.2-1.7c-2.9.7-4.9 2.6-4.6 4.9.3 2 2.9 3.3 5.9 2.6 2.9-.7 4.9-2.6 4.6-4.6-.3-1.9-3-3.2-5.9-2.9zM244.8 8C106.1 8 0 113.3 0 252c0 110.9 69.8 205.8 169.5 239.2 12.8 2.3 17.3-5.6 17.3-12.1 0-6.2-.3-40.4-.3-61.4 0 0-70 15-84.7-29.8 0 0-11.4-29.1-27.8-36.6 0 0-22.9-15.7 1.6-15.4 0 0 24.9 2 38.6 25.8 21.9 38.6 58.6 27.5 72.9 20.9 2.3-16 8.8-27.1 16-33.7-55.9-6.2-112.3-14.3-112.3-110.5 0-27.5 7.6-41.3 23.6-58.9-2.6-6.5-11.1-33.3 2.6-67.9 20.9-6.5 69 27 69 27 20-5.6 41.5-8.5 62.8-8.5s42.8 2.9 62.8 8.5c0 0 48.1-33.6 69-27 13.7 34.7 5.2 61.4 2.6 67.9 16 17.7 25.8 31.5 25.8 58.9 0 96.5-58.9 104.2-114.8 110.5 9.2 7.9 17 22.9 17 46.4 0 33.7-.3 75.4-.3 83.6 0 6.5 4.6 14.4 17.3 12.1C428.2 457.8 496 362.9 496 252 496 113.3 383.5 8 244.8 8zM97.2 352.9c-1.3 1-1 3.3.7 5.2 1.6 1.6 3.9 2.3 5.2 1 1.3-1 1-3.3-.7-5.2-1.6-1.6-3.9-2.3-5.2-1zm-10.8-8.1c-.7 1.3.3 2.9 2.3 3.9 1.6 1 3.6.7 4.3-.7.7-1.3-.3-2.9-2.3-3.9-2-.6-3.6-.3-4.3.7zm32.4 35.6c-1.6 1.3-1 4.3 1.3 6.2 2.3 2.3 5.2 2.6 6.5 1 1.3-1.3.7-4.3-1.3-6.2-2.2-2.3-5.2-2.6-6.5-1zm-11.4-14.7c-1.6 1-1.6 3.6 0 5.9 1.6 2.3 4.3 3.3 5.6 2.3 1.6-1.3 1.6-3.9 0-6.2-1.4-2.3-4-3.3-5.6-2z"></path>
+            </svg>`,
         },
         {
           href: 'https://discord.gg/usMqNaPczq',
           position: 'right',
-          className: 'navbar-icon navbar-icon-discord',
+          className: 'navbar-icon',
           'aria-label': 'Discord channel',
+          html: `<svg stroke="currentColor" fill="currentColor" stroke-width="0" viewBox="0 0 640 512" height="24" width="24" xmlns="http://www.w3.org/2000/svg"><path d="M524.531,69.836a1.5,1.5,0,0,0-.764-.7A485.065,485.065,0,0,0,404.081,32.03a1.816,1.816,0,0,0-1.923.91,337.461,337.461,0,0,0-14.9,30.6,447.848,447.848,0,0,0-134.426,0,309.541,309.541,0,0,0-15.135-30.6,1.89,1.89,0,0,0-1.924-.91A483.689,483.689,0,0,0,116.085,69.137a1.712,1.712,0,0,0-.788.676C39.068,183.651,18.186,294.69,28.43,404.354a2.016,2.016,0,0,0,.765,1.375A487.666,487.666,0,0,0,176.02,479.918a1.9,1.9,0,0,0,2.063-.676A348.2,348.2,0,0,0,208.12,430.4a1.86,1.86,0,0,0-1.019-2.588,321.173,321.173,0,0,1-45.868-21.853,1.885,1.885,0,0,1-.185-3.126c3.082-2.309,6.166-4.711,9.109-7.137a1.819,1.819,0,0,1,1.9-.256c96.229,43.917,200.41,43.917,295.5,0a1.812,1.812,0,0,1,1.924.233c2.944,2.426,6.027,4.851,9.132,7.16a1.884,1.884,0,0,1-.162,3.126,301.407,301.407,0,0,1-45.89,21.83,1.875,1.875,0,0,0-1,2.611,391.055,391.055,0,0,0,30.014,48.815,1.864,1.864,0,0,0,2.063.7A486.048,486.048,0,0,0,610.7,405.729a1.882,1.882,0,0,0,.765-1.352C623.729,277.594,590.933,167.465,524.531,69.836ZM222.491,337.58c-28.972,0-52.844-26.587-52.844-59.239S193.056,219.1,222.491,219.1c29.665,0,53.306,26.82,52.843,59.239C275.334,310.993,251.924,337.58,222.491,337.58Zm195.38,0c-28.971,0-52.843-26.587-52.843-59.239S388.437,219.1,417.871,219.1c29.667,0,53.307,26.82,52.844,59.239C470.715,310.993,447.538,337.58,417.871,337.58Z"></path></svg>`,
         },
         {
           href: 'https://t.me/techinterviewhandbook',
           position: 'right',
           className: 'navbar-icon navbar-icon-telegram',
           'aria-label': 'Telegram channel',
+          html: `<svg stroke="currentColor" fill="currentColor" stroke-width="0" viewBox="0 0 448 512" height="24" width="24" xmlns="http://www.w3.org/2000/svg"><path d="M446.7 98.6l-67.6 318.8c-5.1 22.5-18.4 28.1-37.3 17.5l-103-75.9-49.7 47.8c-5.5 5.5-10.1 10.1-20.7 10.1l7.4-104.9 190.9-172.5c8.3-7.4-1.8-11.5-12.9-4.1L117.8 284 16.2 252.2c-22.1-6.9-22.5-22.1 4.6-32.7L418.2 66.4c18.4-6.9 34.5 4.1 28.5 32.2z"></path></svg>`,
         },
         {
           href: 'https://twitter.com/techinterviewhb',
           position: 'right',
           className: 'navbar-icon navbar-icon-twitter',
           'aria-label': 'Twitter page',
+          html: `<svg stroke="currentColor" fill="currentColor" stroke-width="0" viewBox="0 0 512 512" height="24" width="24" xmlns="http://www.w3.org/2000/svg"><path d="M459.37 151.716c.325 4.548.325 9.097.325 13.645 0 138.72-105.583 298.558-298.558 298.558-59.452 0-114.68-17.219-161.137-47.106 8.447.974 16.568 1.299 25.34 1.299 49.055 0 94.213-16.568 130.274-44.832-46.132-.975-84.792-31.188-98.112-72.772 6.498.974 12.995 1.624 19.818 1.624 9.421 0 18.843-1.3 27.614-3.573-48.081-9.747-84.143-51.98-84.143-102.985v-1.299c13.969 7.797 30.214 12.67 47.431 13.319-28.264-18.843-46.781-51.005-46.781-87.391 0-19.492 5.197-37.36 14.294-52.954 51.655 63.675 129.3 105.258 216.365 109.807-1.624-7.797-2.599-15.918-2.599-24.04 0-57.828 46.782-104.934 104.934-104.934 30.213 0 57.502 12.67 76.67 33.137 23.715-4.548 46.456-13.32 66.599-25.34-7.798 24.366-24.366 44.833-46.132 57.827 21.117-2.273 41.584-8.122 60.426-16.243-14.292 20.791-32.161 39.308-52.628 54.253z"></path></svg>`,
         },
       ],
     },
diff --git a/website/src/css/custom.css b/website/src/css/custom.css
index ee36df30..6034143a 100755
--- a/website/src/css/custom.css
+++ b/website/src/css/custom.css
@@ -147,74 +147,21 @@ div[class^='announcementBar_'] {
   margin-bottom: 0 !important;
 }
 
-.navbar-icon:before {
-  background-repeat: no-repeat;
-  content: '';
+.navbar-icon {
+  border-radius: 50%;
   display: flex;
-  height: 24px;
-  width: 24px;
-  transition: all 300ms ease-in-out;
+  height: 32px;
+  width: 32px;
+  align-items: center;
+  justify-content: center;
+  margin-right: 12px;
+  padding: 0;
+  transition: background var(--ifm-transition-fast);
 }
 
 .navbar-icon:hover {
-  opacity: 0.8;
-}
-
-.navbar-icon-github:before {
-  background-image: url('/img/icons8-github.svg');
-}
-
-html[data-theme='dark'] .navbar-icon-github:before {
-  background-image: url('/img/icons8-github-light.svg');
-  height: 28px;
-  width: 28px;
-}
-
-.navbar-icon-twitter:before {
-  background-image: url('/img/icons8-twitter.svg');
-}
-
-html[data-theme='dark'] .navbar-icon-twitter:before {
-  background-image: url('/img/icons8-twitter-light.svg');
-}
-
-.navbar-icon-facebook:before {
-  background-image: url('/img/icons8-facebook.svg');
-  width: 28px;
-}
-
-html[data-theme='dark'] .navbar-icon-facebook:before {
-  background-image: url('/img/icons8-facebook-light.svg');
-  height: 28px;
-  width: 28px;
-}
-
-.navbar-icon-telegram:before {
-  background-image: url('/img/icons8-telegram.svg');
-}
-
-html[data-theme='dark'] .navbar-icon-telegram:before {
-  background-image: url('/img/icons8-telegram-light.svg');
-  height: 28px;
-  width: 24px;
-}
-
-.navbar-icon-instagram:before {
-  background-image: url('/img/instagram.svg');
-  width: 24px;
-}
-
-html[data-theme='dark'] .navbar-icon-instagram:before {
-  background-image: url('/img/instagram-light.svg');
-}
-
-.navbar-icon-discord:before {
-  background-image: url('/img/discord.svg');
-  width: 31px;
-}
-
-html[data-theme='dark'] .navbar-icon-discord:before {
-  background-image: url('/img/discord-light.svg');
+  background: var(--ifm-color-emphasis-200);
+  color: inherit;
 }
 
 .admonition-heading h5 {
diff --git a/website/static/img/icons8-facebook-light.svg b/website/static/img/icons8-facebook-light.svg
deleted file mode 100644
index be47b238..00000000
--- a/website/static/img/icons8-facebook-light.svg
+++ /dev/null
@@ -1 +0,0 @@
-<svg fill="#fff" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 30 30" width="28px" height="28px"><path d="M15,3C8.373,3,3,8.373,3,15c0,6.016,4.432,10.984,10.206,11.852V18.18h-2.969v-3.154h2.969v-2.099c0-3.475,1.693-5,4.581-5 c1.383,0,2.115,0.103,2.461,0.149v2.753h-1.97c-1.226,0-1.654,1.163-1.654,2.473v1.724h3.593L19.73,18.18h-3.106v8.697 C22.481,26.083,27,21.075,27,15C27,8.373,21.627,3,15,3z"/></svg>
diff --git a/website/static/img/icons8-facebook.svg b/website/static/img/icons8-facebook.svg
deleted file mode 100644
index 9931883f..00000000
--- a/website/static/img/icons8-facebook.svg
+++ /dev/null
@@ -1 +0,0 @@
-<svg fill="#444950" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 28 28" width="24px" height="24px"><path d="M15,3C8.373,3,3,8.373,3,15c0,6.016,4.432,10.984,10.206,11.852V18.18h-2.969v-3.154h2.969v-2.099c0-3.475,1.693-5,4.581-5 c1.383,0,2.115,0.103,2.461,0.149v2.753h-1.97c-1.226,0-1.654,1.163-1.654,2.473v1.724h3.593L19.73,18.18h-3.106v8.697 C22.481,26.083,27,21.075,27,15C27,8.373,21.627,3,15,3z"/></svg>
diff --git a/website/static/img/icons8-github-light.svg b/website/static/img/icons8-github-light.svg
deleted file mode 100644
index 3fbd5fc2..00000000
--- a/website/static/img/icons8-github-light.svg
+++ /dev/null
@@ -1 +0,0 @@
-<svg fill="#fff" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" width="28px" height="28px">    <path d="M10.9,2.1c-4.6,0.5-8.3,4.2-8.8,8.7c-0.5,4.7,2.2,8.9,6.3,10.5C8.7,21.4,9,21.2,9,20.8v-1.6c0,0-0.4,0.1-0.9,0.1 c-1.4,0-2-1.2-2.1-1.9c-0.1-0.4-0.3-0.7-0.6-1C5.1,16.3,5,16.3,5,16.2C5,16,5.3,16,5.4,16c0.6,0,1.1,0.7,1.3,1c0.5,0.8,1.1,1,1.4,1 c0.4,0,0.7-0.1,0.9-0.2c0.1-0.7,0.4-1.4,1-1.8c-2.3-0.5-4-1.8-4-4c0-1.1,0.5-2.2,1.2-3C7.1,8.8,7,8.3,7,7.6C7,7.2,7,6.6,7.3,6 c0,0,1.4,0,2.8,1.3C10.6,7.1,11.3,7,12,7s1.4,0.1,2,0.3C15.3,6,16.8,6,16.8,6C17,6.6,17,7.2,17,7.6c0,0.8-0.1,1.2-0.2,1.4 c0.7,0.8,1.2,1.8,1.2,3c0,2.2-1.7,3.5-4,4c0.6,0.5,1,1.4,1,2.3v2.6c0,0.3,0.3,0.6,0.7,0.5c3.7-1.5,6.3-5.1,6.3-9.3 C22,6.1,16.9,1.4,10.9,2.1z"/></svg>
diff --git a/website/static/img/icons8-github.svg b/website/static/img/icons8-github.svg
deleted file mode 100644
index d198f327..00000000
--- a/website/static/img/icons8-github.svg
+++ /dev/null
@@ -1 +0,0 @@
-<svg fill="#444950" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" width="24px" height="24px">    <path d="M10.9,2.1c-4.6,0.5-8.3,4.2-8.8,8.7c-0.5,4.7,2.2,8.9,6.3,10.5C8.7,21.4,9,21.2,9,20.8v-1.6c0,0-0.4,0.1-0.9,0.1 c-1.4,0-2-1.2-2.1-1.9c-0.1-0.4-0.3-0.7-0.6-1C5.1,16.3,5,16.3,5,16.2C5,16,5.3,16,5.4,16c0.6,0,1.1,0.7,1.3,1c0.5,0.8,1.1,1,1.4,1 c0.4,0,0.7-0.1,0.9-0.2c0.1-0.7,0.4-1.4,1-1.8c-2.3-0.5-4-1.8-4-4c0-1.1,0.5-2.2,1.2-3C7.1,8.8,7,8.3,7,7.6C7,7.2,7,6.6,7.3,6 c0,0,1.4,0,2.8,1.3C10.6,7.1,11.3,7,12,7s1.4,0.1,2,0.3C15.3,6,16.8,6,16.8,6C17,6.6,17,7.2,17,7.6c0,0.8-0.1,1.2-0.2,1.4 c0.7,0.8,1.2,1.8,1.2,3c0,2.2-1.7,3.5-4,4c0.6,0.5,1,1.4,1,2.3v2.6c0,0.3,0.3,0.6,0.7,0.5c3.7-1.5,6.3-5.1,6.3-9.3 C22,6.1,16.9,1.4,10.9,2.1z"/></svg>
diff --git a/website/static/img/icons8-telegram-light.svg b/website/static/img/icons8-telegram-light.svg
deleted file mode 100644
index f063ac27..00000000
--- a/website/static/img/icons8-telegram-light.svg
+++ /dev/null
@@ -1 +0,0 @@
-<svg fill="#fff" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 18" width="24px" height="28px"><path d="M18.3763847,0.715862633 L0.657316069,7.58408686 C-0.055723353,7.90390989 -0.296898352,8.54445419 0.484943384,8.89205895 L5.03068631,10.3441163 L16.0216017,3.51640121 C16.6217013,3.08775321 17.2360953,3.20206181 16.7074354,3.67356793 L7.26770364,12.2647747 L6.97116516,15.9005651 C7.24582814,16.4619562 7.74872683,16.4645454 8.06949519,16.1855373 L10.6811472,13.7015864 L15.1540014,17.0682547 C16.1928401,17.6864776 16.7581126,17.2875139 16.9816217,16.1544451 L19.9154327,2.19078227 C20.2200387,0.796019408 19.7005663,0.181489627 18.3763847,0.715862633 Z"></path></svg>
diff --git a/website/static/img/icons8-telegram.svg b/website/static/img/icons8-telegram.svg
deleted file mode 100644
index 1c595b00..00000000
--- a/website/static/img/icons8-telegram.svg
+++ /dev/null
@@ -1 +0,0 @@
-<svg fill="#444950" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 18" width="24px" height="24px"><path d="M18.3763847,0.715862633 L0.657316069,7.58408686 C-0.055723353,7.90390989 -0.296898352,8.54445419 0.484943384,8.89205895 L5.03068631,10.3441163 L16.0216017,3.51640121 C16.6217013,3.08775321 17.2360953,3.20206181 16.7074354,3.67356793 L7.26770364,12.2647747 L6.97116516,15.9005651 C7.24582814,16.4619562 7.74872683,16.4645454 8.06949519,16.1855373 L10.6811472,13.7015864 L15.1540014,17.0682547 C16.1928401,17.6864776 16.7581126,17.2875139 16.9816217,16.1544451 L19.9154327,2.19078227 C20.2200387,0.796019408 19.7005663,0.181489627 18.3763847,0.715862633 Z"></path></svg>
diff --git a/website/static/img/icons8-twitter-light.svg b/website/static/img/icons8-twitter-light.svg
deleted file mode 100644
index 3e9c79ab..00000000
--- a/website/static/img/icons8-twitter-light.svg
+++ /dev/null
@@ -1 +0,0 @@
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diff --git a/website/static/img/icons8-twitter.svg b/website/static/img/icons8-twitter.svg
deleted file mode 100644
index 8698c876..00000000
--- a/website/static/img/icons8-twitter.svg
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deleted file mode 100644
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