diff --git a/_includes/post-paginator.html b/_includes/post-paginator.html
index 409fe7a..9a792d2 100644
--- a/_includes/post-paginator.html
+++ b/_includes/post-paginator.html
@@ -1,6 +1,6 @@
 <!-- The paginator for post list on HomgPage. -->
 
-<ul class="pagination align-items-center mt-4 ps-lg-2">
+<ul class="pagination align-items-center my-4 ps-lg-2">
   <!-- left arrow -->
   {% if paginator.previous_page %}
     {% assign prev_url = paginator.previous_page_path | relative_url %}
diff --git a/_includes/topbar.html b/_includes/topbar.html
index a6d584d..0092f69 100644
--- a/_includes/topbar.html
+++ b/_includes/topbar.html
@@ -3,7 +3,7 @@
 <div id="topbar-wrapper">
   <div
     id="topbar"
-    class="container d-flex align-items-center justify-content-between h-100 px-3 px-md-4 px-xxl-5"
+    class="container d-flex align-items-center justify-content-between h-100"
   >
     <span id="breadcrumb">
       {% assign paths = page.url | split: '/' %}
diff --git a/_javascript/modules/components/back-to-top.js b/_javascript/modules/components/back-to-top.js
index 2fe30fb..6088d76 100644
--- a/_javascript/modules/components/back-to-top.js
+++ b/_javascript/modules/components/back-to-top.js
@@ -4,10 +4,7 @@
 
 export function back2top() {
   $(window).on('scroll', () => {
-    if (
-      $(window).scrollTop() > 50 &&
-      $('#sidebar-trigger').css('display') === 'none'
-    ) {
+    if ($(window).scrollTop() > 50) {
       $('#back-to-top').fadeIn();
     } else {
       $('#back-to-top').fadeOut();
diff --git a/_javascript/modules/components/convert-title.js b/_javascript/modules/components/convert-title.js
deleted file mode 100644
index fb5c818..0000000
--- a/_javascript/modules/components/convert-title.js
+++ /dev/null
@@ -1,66 +0,0 @@
-/**
- * Top bar title auto change while scrolling up/down in mobile screens.
- */
-const titleSelector = 'div.post>h1:first-of-type';
-const $pageTitle = $(titleSelector);
-const $topbarTitle = $('#topbar-title');
-const defaultTitleText = $topbarTitle.text().trim();
-
-export function convertTitle() {
-  if (
-    $pageTitle.length === 0 /* on Home page */ ||
-    $pageTitle.hasClass('dynamic-title') ||
-    $topbarTitle.is(':hidden')
-  ) {
-    /* not in mobile views */
-    return;
-  }
-
-  let pageTitleText = $pageTitle.text().trim();
-  let hasScrolled = false;
-  let lastScrollTop = 0;
-
-  if ($('#page-category').length || $('#page-tag').length) {
-    /* The title in Category or Tag page will be "<title> <count_of_posts>" */
-    if (/\s/.test(pageTitleText)) {
-      pageTitleText = pageTitleText.replace(/[0-9]/g, '').trim();
-    }
-  }
-
-  // When the page is scrolled down and then refreshed, the topbar title needs to be initialized
-  if ($pageTitle.offset().top < $(window).scrollTop()) {
-    $topbarTitle.text(pageTitleText);
-  }
-
-  let options = {
-    rootMargin: '-48px 0px 0px 0px', // 48px equals to the topbar height (3rem)
-    threshold: [0, 1]
-  };
-
-  let observer = new IntersectionObserver((entries) => {
-    if (!hasScrolled) {
-      hasScrolled = true;
-      return;
-    }
-
-    let curScrollTop = $(window).scrollTop();
-    let isScrollDown = lastScrollTop < curScrollTop;
-    lastScrollTop = curScrollTop;
-    let heading = entries[0];
-
-    if (isScrollDown) {
-      if (heading.intersectionRatio === 0) {
-        $topbarTitle.text(pageTitleText);
-      }
-    } else {
-      if (heading.intersectionRatio === 1) {
-        $topbarTitle.text(defaultTitleText);
-      }
-    }
-  }, options);
-
-  observer.observe(document.querySelector(titleSelector));
-
-  /* Click title will scroll to top */
-  $topbarTitle.on('click', () => window.scrollTo(0, 0));
-}
diff --git a/_javascript/modules/components/search-display.js b/_javascript/modules/components/search-display.js
index 2e38f5e..7862f39 100644
--- a/_javascript/modules/components/search-display.js
+++ b/_javascript/modules/components/search-display.js
@@ -4,7 +4,7 @@
 const $btnSbTrigger = $('#sidebar-trigger');
 const $btnSearchTrigger = $('#search-trigger');
 const $btnCancel = $('#search-cancel');
-const $main = $('#main');
+const $content = $('#main>.row');
 const $topbarTitle = $('#topbar-title');
 const $searchWrapper = $('#search-wrapper');
 const $resultWrapper = $('#search-result-wrapper');
@@ -58,7 +58,7 @@ class ResultSwitch {
       // the block method must be called before $(#main) unloaded.
       ScrollBlocker.on();
       $resultWrapper.removeClass(C_UNLOADED);
-      $main.addClass(C_UNLOADED);
+      $content.addClass(C_UNLOADED);
       ScrollBlocker.resultVisible = true;
     }
   }
@@ -70,7 +70,7 @@ class ResultSwitch {
         $hints.removeClass(C_UNLOADED);
       }
       $resultWrapper.addClass(C_UNLOADED);
-      $main.removeClass(C_UNLOADED);
+      $content.removeClass(C_UNLOADED);
 
       // now the release method must be called after $(#main) display
       ScrollBlocker.off();
diff --git a/_javascript/modules/components/topbar-switcher.js b/_javascript/modules/components/topbar-switcher.js
deleted file mode 100644
index 1b0d025..0000000
--- a/_javascript/modules/components/topbar-switcher.js
+++ /dev/null
@@ -1,99 +0,0 @@
-/**
- * Hide Header on scroll down
- */
-import ScrollHelper from './utils/scroll-helper';
-
-const $searchInput = $('#search-input');
-const delta = ScrollHelper.getTopbarHeight();
-
-let lastScrollTop = 0;
-
-function hasScrolled() {
-  let st = $(window).scrollTop();
-
-  /* Make sure they scroll more than delta */
-  if (Math.abs(lastScrollTop - st) <= delta) {
-    return;
-  }
-
-  if (st > lastScrollTop) {
-    /* Scroll down */
-    ScrollHelper.hideTopbar();
-
-    if ($searchInput.is(':focus')) {
-      $searchInput.trigger('blur'); /* remove focus */
-    }
-  } else {
-    /* Scroll up */
-
-    // has not yet scrolled to the bottom of the screen, that is, there is still space for scrolling
-    if (st + $(window).height() < $(document).height()) {
-      if (ScrollHelper.hasScrollUpTask()) {
-        return;
-      }
-
-      if (ScrollHelper.topbarLocked()) {
-        // avoid redundant scroll up event from smooth scrolling
-        ScrollHelper.unlockTopbar();
-      } else {
-        if (ScrollHelper.orientationLocked()) {
-          // avoid device auto scroll up on orientation change
-          ScrollHelper.unLockOrientation();
-        } else {
-          ScrollHelper.showTopbar();
-        }
-      }
-    }
-  }
-
-  lastScrollTop = st;
-} // hasScrolled()
-
-function handleLandscape() {
-  if ($(window).scrollTop() === 0) {
-    return;
-  }
-  ScrollHelper.lockOrientation();
-  ScrollHelper.hideTopbar();
-}
-
-export function switchTopbar() {
-  const orientation = screen.orientation;
-  let didScroll = false;
-
-  const handleOrientationChange = () => {
-    const type = orientation.type;
-    if (type === 'landscape-primary' || type === 'landscape-secondary') {
-      handleLandscape();
-    }
-  };
-
-  const handleWindowChange = () => {
-    if ($(window).width() < $(window).height()) {
-      // before rotating, it is still in portrait mode.
-      handleLandscape();
-    }
-  };
-
-  const handleScroll = () => {
-    didScroll = true;
-  };
-
-  const checkScroll = () => {
-    if (didScroll) {
-      hasScrolled();
-      didScroll = false;
-    }
-  };
-
-  if (orientation) {
-    orientation.addEventListener('change', handleOrientationChange);
-  } else {
-    // for the browsers that not support `window.screen.orientation` API
-    $(window).on('orientationchange', handleWindowChange);
-  }
-
-  $(window).on('scroll', handleScroll);
-
-  setInterval(checkScroll, 250);
-}
diff --git a/_javascript/modules/components/utils/scroll-helper.js b/_javascript/modules/components/utils/scroll-helper.js
deleted file mode 100644
index 78ad9c8..0000000
--- a/_javascript/modules/components/utils/scroll-helper.js
+++ /dev/null
@@ -1,64 +0,0 @@
-/**
- * A tool for smooth scrolling and topbar switcher
- */
-
-const ATTR_TOPBAR_VISIBLE = 'data-topbar-visible';
-const $body = $('body');
-const $topbarWrapper = $('#topbar-wrapper');
-
-export default class ScrollHelper {
-  static scrollUpCount = 0; // the number of times the scroll up was triggered by ToC or anchor
-  static topbarIsLocked = false;
-  static orientationIsLocked = false;
-
-  static hideTopbar() {
-    $body.attr(ATTR_TOPBAR_VISIBLE, 'false');
-  }
-
-  static showTopbar() {
-    $body.attr(ATTR_TOPBAR_VISIBLE, 'true');
-  }
-
-  // scroll up
-
-  static addScrollUpTask() {
-    ScrollHelper.scrollUpCount += 1;
-    if (!ScrollHelper.topbarIsLocked) {
-      ScrollHelper.topbarIsLocked = true;
-    }
-  }
-
-  static popScrollUpTask() {
-    ScrollHelper.scrollUpCount -= 1;
-  }
-
-  static hasScrollUpTask() {
-    return ScrollHelper.scrollUpCount > 0;
-  }
-
-  static topbarLocked() {
-    return ScrollHelper.topbarIsLocked === true;
-  }
-
-  static unlockTopbar() {
-    ScrollHelper.topbarIsLocked = false;
-  }
-
-  static getTopbarHeight() {
-    return $topbarWrapper.outerHeight();
-  }
-
-  // orientation change
-
-  static orientationLocked() {
-    return ScrollHelper.orientationIsLocked === true;
-  }
-
-  static lockOrientation() {
-    ScrollHelper.orientationIsLocked = true;
-  }
-
-  static unLockOrientation() {
-    ScrollHelper.orientationIsLocked = false;
-  }
-}
diff --git a/_javascript/modules/layouts/topbar.js b/_javascript/modules/layouts/topbar.js
index 76549bf..cfcd0ed 100644
--- a/_javascript/modules/layouts/topbar.js
+++ b/_javascript/modules/layouts/topbar.js
@@ -1,9 +1,5 @@
-import { convertTitle } from '../components/convert-title';
 import { displaySearch } from '../components/search-display';
-import { switchTopbar } from '../components/topbar-switcher';
 
 export function initTopbar() {
-  convertTitle();
   displaySearch();
-  switchTopbar();
 }
diff --git a/_layouts/default.html b/_layouts/default.html
index d6ff29c..bc434d6 100644
--- a/_layouts/default.html
+++ b/_layouts/default.html
@@ -19,16 +19,15 @@ layout: compress
 <html lang="{{ site.alt_lang | default: site.lang }}" {{ prefer_mode }}>
   {% include head.html %}
 
-  <body data-topbar-visible="true">
+  <body>
     {% include sidebar.html lang=lang %}
-    {% include topbar.html lang=lang %}
 
     <div id="main-wrapper" class="d-flex justify-content-center">
       <div id="main" class="container px-xxl-5">
+        {% include topbar.html lang=lang %}
         {{ content }}
+        {% include search-results.html lang=lang %}
       </div>
-
-      {% include search-results.html lang=lang %}
     </div>
 
     {% include footer.html lang=lang %}
diff --git a/_sass/addon/commons.scss b/_sass/addon/commons.scss
index 36b9b82..f7b1390 100644
--- a/_sass/addon/commons.scss
+++ b/_sass/addon/commons.scss
@@ -252,10 +252,6 @@ i {
       transition: all 0.3s ease-in;
     }
   }
-
-  [data-topbar-visible='true'] & > div {
-    top: 5.5rem;
-  }
 }
 
 #access-lastmod {
@@ -938,29 +934,7 @@ $btn-mb: 0.5rem;
 
 #topbar-wrapper {
   height: $topbar-height;
-  position: fixed;
-  top: 0;
-  left: $sidebar-width; /* same as sidebar width */
-  right: 0;
-  transition: top 0.2s ease-in-out;
-  z-index: 50;
   background-color: var(--topbar-bg);
-
-  [data-topbar-visible='false'] & {
-    top: -$topbar-height; /* same as topbar height. */
-  }
-
-  &::before {
-    $blur: 12px;
-
-    content: '';
-    position: absolute;
-    width: 100%;
-    height: $topbar-height;
-    z-index: -1;
-    -webkit-backdrop-filter: blur($blur);
-    backdrop-filter: blur($blur);
-  }
 }
 
 #topbar {
@@ -1168,11 +1142,6 @@ $btn-mb: 0.5rem;
   @include pl-pr(0);
 }
 
-#core-wrapper,
-#panel-wrapper {
-  margin-top: $topbar-height; /* same as the height of topbar */
-}
-
 #topbar-wrapper.row,
 #main > .row,
 #search-result-wrapper > .row {
@@ -1182,12 +1151,14 @@ $btn-mb: 0.5rem;
 /* --- button back-to-top --- */
 
 #back-to-top {
-  $size: 2.7em;
+  $size: 3rem;
 
   display: none;
   z-index: 1;
   cursor: pointer;
   position: fixed;
+  right: 1rem;
+  bottom: 2rem;
   background: var(--button-bg);
   color: var(--btn-backtotop-color);
   padding: 0;
@@ -1198,6 +1169,11 @@ $btn-mb: 0.5rem;
   transition: transform 0.2s ease-out;
   -webkit-transition: transform 0.2s ease-out;
 
+  &:hover {
+    transform: translate3d(0, -5px, 0);
+    -webkit-transform: translate3d(0, -5px, 0);
+  }
+
   i {
     line-height: $size;
     position: relative;
@@ -1205,11 +1181,6 @@ $btn-mb: 0.5rem;
   }
 }
 
-#back-to-top:hover {
-  transform: translate3d(0, -5px, 0);
-  -webkit-transform: translate3d(0, -5px, 0);
-}
-
 #notification {
   @-webkit-keyframes popup {
     from {
@@ -1344,11 +1315,14 @@ $btn-mb: 0.5rem;
       transform: translateX(0);
     }
 
-    #topbar-wrapper,
     #main-wrapper,
     footer {
       transform: translateX(#{$sidebar-width});
     }
+
+    #back-to-top {
+      visibility: hidden;
+    }
   }
 
   #sidebar {
@@ -1360,8 +1334,6 @@ $btn-mb: 0.5rem;
 
   #main-wrapper {
     @include slide;
-
-    padding-top: $topbar-height;
   }
 
   #topbar,
@@ -1413,12 +1385,6 @@ $btn-mb: 0.5rem;
   }
 } /* max-width: 849px */
 
-@media all and (max-width: 849px) and (orientation: portrait) {
-  [data-topbar-visible='false'] #topbar-wrapper {
-    top: 0;
-  }
-}
-
 /* Phone & Pad */
 @media all and (min-width: 577px) and (max-width: 1199px) {
   footer .d-flex > div {
@@ -1470,8 +1436,8 @@ $btn-mb: 0.5rem;
   }
 
   #search-result-wrapper {
-    margin-top: 3rem;
     max-width: $main-content-max-width;
+    justify-content: start !important;
   }
 
   .post {
@@ -1596,7 +1562,6 @@ $btn-mb: 0.5rem;
     );
   }
 
-  #topbar,
   #main,
   footer > .container {
     max-width: $main-content-max-width;
diff --git a/_sass/layout/home.scss b/_sass/layout/home.scss
index 5092c69..2a10842 100644
--- a/_sass/layout/home.scss
+++ b/_sass/layout/home.scss
@@ -5,6 +5,10 @@
 #post-list {
   margin-top: 2rem;
 
+  &:only-child {
+    margin-bottom: 3.75rem;
+  }
+
   a.card-wrapper {
     display: block;