diff --git a/directory/src/component/dropdown.jsx b/directory/src/component/dropdown.jsx
index b54ede2..3ab7869 100644
--- a/directory/src/component/dropdown.jsx
+++ b/directory/src/component/dropdown.jsx
@@ -24,29 +24,38 @@ export default function Dropdown(props) {
         <ul className={classes.menu} style={props.activeColor}>
           {
             props.menu.map((item) => {
-              if (item.type === 'group') {
-                return (
-                  <section
-                    key={item.name}
-                    className={classes.group}
-                  >
-                    <section className={classes.line} />
-                    <section className={classes.text}>{item.name}</section>
-                  </section>
-                )
+              switch (item.type) {
+                case 'date': {
+                  return (
+                    <section
+                      key={item.name}
+                      className={classes.date}
+                    >
+                      <section className={classes.line} />
+                      <section className={classes.text}>{item.name}</section>
+                    </section>
+                  )
+                }
+                case 'custom': {
+                  return (
+                    item.component
+                  )
+                }
+                default: {
+                  return (
+                    <li
+                      key={item.name}
+                      className={`${classes.item} ${item.name === props.text || (props.activeRule && props.activeRule(item)) ? classes.active : ''}`}
+                      onClick={() => {
+                        props.onClick(item)
+                        toggleDropdown()
+                      }}
+                    >
+                      <section className={classes.text}>{item.name}</section>
+                    </li>
+                  )
+                }
               }
-              return (
-                <li
-                  key={item.name}
-                  className={`${classes.item} ${item.name === props.text || (props.activeRule && props.activeRule(item)) ? classes.active : ''}`}
-                  onClick={() => {
-                    props.onClick(item)
-                    toggleDropdown()
-                  }}
-                >
-                  <section className={classes.text}>{item.name}</section>
-                </li>
-              )
             })
           }
         </ul>
diff --git a/directory/src/component/scss/dropdown.module.scss b/directory/src/component/scss/dropdown.module.scss
index 36ac819..58afc33 100644
--- a/directory/src/component/scss/dropdown.module.scss
+++ b/directory/src/component/scss/dropdown.module.scss
@@ -56,7 +56,7 @@
     color: var(--link-highlight-color);
     cursor: auto;
 
-    .group {
+    .date {
       font-family: "Bender";
       font-weight: bold;
       font-size: 24px;
diff --git a/directory/src/component/scss/totop_button.module.scss b/directory/src/component/scss/totop_button.module.scss
new file mode 100644
index 0000000..deb33a5
--- /dev/null
+++ b/directory/src/component/scss/totop_button.module.scss
@@ -0,0 +1,84 @@
+.totop-button {
+  position: fixed;
+  user-select: none;
+  z-index: 2;
+  cursor: pointer;
+  height: 2rem;
+  right: 2rem;
+  bottom: 1rem;
+  display: flex;
+  flex-direction: column;
+  align-items: stretch;
+  justify-content: flex-start;
+  width: 3rem;
+  height: 3rem;
+  opacity: 0;
+  transition: opacity cubic-bezier(0.65, 0.05, 0.36, 1) 0.3s;
+
+  &.show {
+    opacity: 1;
+  }
+
+  .bar {
+    position: absolute;
+    width: 100%;
+    height: 0.3rem;
+    background-color: var(--text-color-full);
+    will-change: auto;
+  }
+
+  .bar:nth-child(1) {
+    transform: rotateZ(45deg) scaleX(0.5) translateX(45%);
+  }
+
+  .bar:nth-child(2) {
+    transform: rotateZ(-45deg) scaleX(0.5) translateX(-45%);
+  }
+
+  .bar:nth-child(3), .bar:nth-child(4) {
+    transform: translateY(450%) rotateZ(90deg) scaleX(0.5);
+  }
+
+  &.clicked {
+    .bar:nth-child(1) {
+      animation: transform-1 2s cubic-bezier(0.65, 0.05, 0.36, 1) infinite;
+    }
+
+    .bar:nth-child(2) {
+      animation: transform-2 2s cubic-bezier(0.65, 0.05, 0.36, 1) infinite;
+    }
+
+    .bar:nth-child(3) {
+      animation: transform-3 2s cubic-bezier(0.65, 0.05, 0.36, 1) infinite;
+    }
+
+    .bar:nth-child(4) {
+      animation: transform-4 2s cubic-bezier(0.65, 0.05, 0.36, 1) infinite;
+    }
+  }
+}
+
+@keyframes transform-1 {
+  50% {
+    transform: translateY(450%) rotateZ(-90deg) scaleX(0.5);
+  }
+}
+
+@keyframes transform-2 {
+  50% {
+    transform: translateY(450%) rotateZ(90deg) scaleX(0.5);
+  }
+}
+
+
+@keyframes transform-3 {
+  50% {
+    transform: rotateZ(225deg) scaleX(0.5) translateX(-45%);
+  }
+}
+
+@keyframes transform-4 {
+  50% {
+    transform: rotateZ(-45deg) scaleX(0.5) translateX(-45%);
+  }
+}
\ No newline at end of file
diff --git a/directory/src/component/totop_button.jsx b/directory/src/component/totop_button.jsx
new file mode 100644
index 0000000..d4daf97
--- /dev/null
+++ b/directory/src/component/totop_button.jsx
@@ -0,0 +1,67 @@
+import React, {
+  useEffect,
+  useState,
+  useCallback
+} from 'react';
+import PropTypes from 'prop-types';
+import classes from './scss/totop_button.module.scss'
+
+export default function ToTopButton(props) {
+  const [hidden, setHidden] = useState(true)
+  const [clicked, setClicked] = useState(false)
+
+  useEffect(() => {
+    const handleButton = () => {
+      const scrollBarPos = window.pageYOffset || 0;
+      setHidden(!(scrollBarPos > 100))
+    }
+    window.addEventListener('scroll', handleButton)
+    return () => {
+      window.removeEventListener('scroll', handleButton)
+    }
+  }, [])
+
+  const smoothScroll = useCallback(
+    (target) => {
+      const targetElement = document.querySelector(target);
+      const targetPosition = targetElement.getBoundingClientRect().top + window.pageYOffset;
+      const startPosition = window.pageYOffset;
+      const distance = targetPosition - startPosition;
+      const duration = 1000;
+      let start = null;
+      window.requestAnimationFrame(step);
+      function step(timestamp) {
+        if (!start) start = timestamp;
+        const progress = timestamp - start;
+        window.scrollTo(0, easeInOutCubic(progress, startPosition, distance, duration));
+        if (progress < duration) window.requestAnimationFrame(step);
+      }
+      function easeInOutCubic(t, b, c, d) {
+        t /= d / 2;
+        if (t < 1) return c / 2 * t * t * t + b;
+        t -= 2;
+        return c / 2 * (t * t * t + 2) + b;
+      }
+      setClicked(true)
+      setTimeout(() => {
+        setClicked(false)
+      }, duration)
+    }, [])
+
+  return (
+    <>
+      <section className={`${classes['totop-button']} ${clicked ? classes.clicked : ''} ${hidden ? '' : classes.show} ${props.className ? props.className : ''}`}
+        onClick={() => { smoothScroll("#root") }}
+      >
+        <section className={classes.bar}></section>
+        <section className={classes.bar}></section>
+        <section className={classes.bar}></section>
+        <section className={classes.bar}></section>
+      </section>
+    </>
+  )
+}
+ToTopButton.propTypes = {
+  onClick: PropTypes.func,
+  className: PropTypes.string,
+};
\ No newline at end of file
diff --git a/directory/src/routes/Root.jsx b/directory/src/routes/Root.jsx
index e316add..581aa8f 100644
--- a/directory/src/routes/Root.jsx
+++ b/directory/src/routes/Root.jsx
@@ -31,6 +31,7 @@ import Popup from '@/component/popup';
 import ReturnButton from '@/component/return_button';
 import Border from '@/component/border';
 import CharIcon from '@/component/char_icon';
+import ToTopButton from '@/component/totop_button';
 
 const currentYear = new Date().getFullYear()
 
@@ -132,6 +133,7 @@ export default function Root() {
           </section>
         </section>
         <HeaderButton />
+        <ToTopButton />
         <Outlet />
         <ScrollRestoration />
       </main>
@@ -305,7 +307,7 @@ function HeaderButton() {
       list.push({
         name: key,
         value: null,
-        type: "group",
+        type: "date",
       })
       value.forEach((item) => {
         list.push({