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HTML

              
                <div id="root"></div>
              
            
!

CSS

              
                @import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;500&display=swap');

* {
  box-sizing: border-box;
}

body {
  --main-bg: #f5f4fd;
  --item-hover: #f9f8fb;
  --secondary-bg: #251d33;
  --main-container-bg: #fff;
  --container-shadow: rgba(100, 100, 111, 0.2) 0px 7px 29px 0px;
  --text-color: #00071d;
}

body.dark {
  --main-bg: #00071d;
  --item-hover: #1c2339;
  --secondary-bg: #36415e;
  --main-container-bg: #131c31;
  --text-color: #fff;
  --tooltip-bg: #251d33;
  --container-shadow: rgba( #131c31, 0.2) 0px 7px 29px 0px;
}

html, body {
  width: 100%;
  margin: 0;
  height: 100%;
  font-family: 'Poppins', sans-serif;
}

body {
  background-color: var(--main-bg);
  transition: .3s ease-in-out;
  display: flex;
  justify-content: center;
  align-items: center;
}

.sidebar {
  &-wrapper {
    display: flex;
    flex-direction: column;
    height: 100%;
    
    @media screen and (max-height: 520px) {
       overflow-y: auto;
       overflow-x: hidden;
    }
  }
  &-container {
    background-color: var(--main-container-bg);
    box-shadow: var(--container-shadow);
    border-radius: 10px;
    padding: 16px;
    transition: width .3s ease-in-out;
    position: relative;
    width: 240px;
    height: 100vh;
    max-height: 600px;
  
    &.shrink {
      width: 92px;
    }
  }
  
  &-themeInput {
    opacity: 0;
    width: 0;
    height: 0;
    position: absolute;
  }
  
  &-themeInputText {
    font-size: 14px;
    opacity: 1;
    transform: translatex(0);
    transition: .2s ease-in-out;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    .shrink & {
      width: 0;
      opacity: 0;
      transform: translatex(-8px);
    }
  }
  
  &-themeType {
    width: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 12px 8px;
    text-align: center;
    z-index: 1;
    flex-shrink: 0;
    line-height: 20px;
    
    .shrink & {
      width: 100%;
    }
  }
  
  &-themeContainer {
    padding: 4px;
    border-radius: 4px;
    color: var(--text-color);
    overflow: hidden;
    background-color: var(--main-bg);
    overflow: hidden;
    flex-shrink: 0;
  }
  
  &-themeLabel {
    display: flex;
    justify-content: space-between;
    position: relative;
    cursor: pointer;
    
    svg { width: 18px; height: 18px; }
    &.switched {
      .shrink & .light { display: none; }
      &:before {
        left: 50%;
        .shrink & { left: 2px; }
      }
    }

    &:not(.switched) .shrink & .dark { display: none; }
    &:before {
      content: "";
      position: absolute;
      z-index: 0;
      display: inline-block;
      width: calc(50% - 2px);
      height: calc(100% - 4px);
      border-radius: 4px;
      background-color: var(--main-container-bg);
      left: 2px;
      top: 50%;
      transform: translatey(-50%);
      transition: left .3s ease;
      
      .shrink & { width: calc(100% - 4px); }
    }
  }
  
  &-viewButton {
    position: absolute;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: none;
    right: -10px;
    top: 32px;
    display: flex;
    align-items: center;
    padding: 0;
    cursor: pointer;
    transition: .3s ease-in-out;
    color: #fff;
    box-shadow: var(--container-shadow);
    background-color: var(--secondary-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    
    &:hover { opacity: 0.8; }
    svg { width: 16px; }
    .shrink & { transform: rotatey(-180deg); }
  }
  
  &-list {
    list-style: none;
    padding: 0;
    margin: 12px 0 0;
  }
  
  &-listItem {
    color: var(--text-color);
    display: flex;
    align-items: center;
    animation: fadeInItem .6s forwards;
    transition: background .2s ease-in;
    transform: translatex(-16px);
    opacity: 0;
    padding: 8px 0;
    position: relative;
 
    .shrink & span { visibility: hidden; }
    &.active a { background-color: var(--main-bg); }
    &:not(.active) a:hover {
      background-color: var(--item-hover);
    }
    &:hover .sidebar-listItemText {
      display: inline-block;
      opacity: 1;
      left: calc(100% + 8px);
      visibility: visible;
    }
    + li {
      border-top: 1px solid var(--item-hover);
    } 
    a {
      width: 100%;
      padding: 20px;
      border-radius: 4px;
      display: flex;
      align-items: center;
      cursor: pointer;
    }
  }
  
  &-listIcon {
    width: 20px;
    height: 20px;
    display: inline-block;
    margin-right: 8px;
    flex-shrink: 0;
    
    .shrink & { margin-right: 0; }
  }
  
  &-profileSection {
    display: flex;
    align-items: center;
    margin-top: auto;
    border: 1px solid var(--item-hover);
    padding: 8px 10px;
    border-radius: 28px;
    overflow: hidden;
    height: 60px;
    flex-shrink: 0;
    transition: background .3s ease-in-out;
    cursor: pointer;
    
    &:hover { background-color: var(--item-hover); }
    
    img {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      object-fit: cover;
      margin-right: 8px;
      flex-shrink: 0;
    }
    
    span {
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
      color: var(--text-color);
    }
    
    .shrink & span { display: none; }
    .shrink & { border-radius: 50%; }
  }
  
  &-listItemText {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 20px;
  }
}

.shrink .sidebar-listItemText {
  position: absolute;
  padding: 8px;
  left: 100%;
  opacity: 0;
  background-color: var(--secondary-bg);
  color: #fff;
  font-size: 12px;
  border-radius: 4px;
  transition: left .3s ease-in-out, opacity .3s ease-in-out;
}

@for $i from 0 through 5 {
  .sidebar-listItem:nth-child(n + #{$i}) {
    animation-delay: $i * .2s;
  }
}

@keyframes fadeInItem {
  100% {
    transform: translatex(0px);
    opacity: 1;
  }
}
              
            
!

JS

              
                const { useState } = React;

const Sidebar = () => {
  const [isShrinkView, setIsShrinkView] = React.useState(false);
  const [isDarkMode, setIsDarkMode] = React.useState(false);

  const handleSidebarView = () => {
    setIsShrinkView(!isShrinkView);
  };

  const handleThemeChange = () => {
    setIsDarkMode(!isDarkMode);
    document.body.classList.toggle("dark");
  };

  return (
    <div className={`sidebar-container${isShrinkView ? " shrink" : ""}`}>
      <button
        className="sidebar-viewButton"
        type="button"
        aria-label={isShrinkView ? "Expand Sidebar" : "Shrink Sidebar"}
        title={isShrinkView ? "Expand" : "Shrink"}
        onClick={handleSidebarView}
      >
        <svg
          xmlns="http://www.w3.org/2000/svg"
          width="24"
          height="24"
          viewBox="0 0 24 24"
          fill="none"
          stroke="currentColor"
          stroke-width="2"
          stroke-linecap="round"
          stroke-linejoin="round"
          class="feather feather-chevron-left"
        >
          <polyline points="15 18 9 12 15 6" />
        </svg>
      </button>
      <div className="sidebar-wrapper">
        <div className="sidebar-themeContainer">
          <label
            labelFor="theme-toggle"
            className={`sidebar-themeLabel${isDarkMode ? " switched" : ""}`}
          >
            <input
              className="sidebar-themeInput"
              type="checkbox"
              id="theme-toggle"
              onChange={handleThemeChange}
            />
            <div className="sidebar-themeType light">
              <svg
                xmlns="http://www.w3.org/2000/svg"
                width="24"
                height="24"
                viewBox="0 0 24 24"
                fill="none"
                stroke="currentColor"
                stroke-width="2"
                stroke-linecap="round"
                stroke-linejoin="round"
                className="sidebar-listIcon"
              >
                <circle cx="12" cy="12" r="5" />
                <path d="M12 1v2M12 21v2M4.22 4.22l1.42 1.42M18.36 18.36l1.42 1.42M1 12h2M21 12h2M4.22 19.78l1.42-1.42M18.36 5.64l1.42-1.42" />
              </svg>
              <span className="sidebar-themeInputText">Light</span>
            </div>
            <div className="sidebar-themeType dark">
              <svg
                xmlns="http://www.w3.org/2000/svg"
                width="24"
                height="24"
                viewBox="0 0 24 24"
                fill="none"
                stroke="currentColor"
                stroke-width="2"
                stroke-linecap="round"
                stroke-linejoin="round"
                className="sidebar-listIcon"
              >
                <path d="M21 12.79A9 9 0 1 1 11.21 3 7 7 0 0 0 21 12.79z" />
              </svg>
              <span className="sidebar-themeInputText">Dark</span>
            </div>
          </label>
        </div>
        <ul className="sidebar-list">
          <li className="sidebar-listItem active">
            <a>
              <svg
                xmlns="http://www.w3.org/2000/svg"
                fill="none"
                stroke="currentColor"
                viewBox="0 0 24 24"
                stroke-width="2"
                stroke-linecap="round"
                stroke-linejoin="round"
                className="sidebar-listIcon"
              >
                <rect x="3" y="3" rx="2" ry="2" className="sidebar-listIcon" />
                <path d="M3 9h18M9 21V9" />
              </svg>
              <span className="sidebar-listItemText">Dashboard</span>
            </a>
          </li>
          <li className="sidebar-listItem">
            <a>
              <svg
                xmlns="http://www.w3.org/2000/svg"
                viewBox="0 0 24 24"
                fill="none"
                stroke="currentColor"
                stroke-width="2"
                stroke-linecap="round"
                stroke-linejoin="round"
                className="sidebar-listIcon"
              >
                <polyline points="22 12 16 12 14 15 10 15 8 12 2 12" />
                <path d="M5.45 5.11L2 12v6a2 2 0 0 0 2 2h16a2 2 0 0 0 2-2v-6l-3.45-6.89A2 2 0 0 0 16.76 4H7.24a2 2 0 0 0-1.79 1.11z" />
              </svg>
              <span className="sidebar-listItemText">Inbox</span>
            </a>
          </li>
          <li className="sidebar-listItem">
            <a>
              <svg
                xmlns="http://www.w3.org/2000/svg"
                viewBox="0 0 24 24"
                fill="none"
                stroke="currentColor"
                stroke-width="2"
                stroke-linecap="round"
                stroke-linejoin="round"
                className="sidebar-listIcon"
              >
                <rect x="3" y="4" width="18" height="18" rx="2" ry="2" />
                <line x1="16" y1="2" x2="16" y2="6" />
                <line x1="8" y1="2" x2="8" y2="6" />
                <line x1="3" y1="10" x2="21" y2="10" />
              </svg>
              <span className="sidebar-listItemText">Calendar</span>
            </a>
          </li>
          <li className="sidebar-listItem">
            <a>
              <svg
                xmlns="http://www.w3.org/2000/svg"
                viewBox="0 0 24 24"
                fill="none"
                stroke="currentColor"
                stroke-width="2"
                stroke-linecap="round"
                stroke-linejoin="round"
                className="sidebar-listIcon"
              >
                <polyline points="22 12 18 12 15 21 9 3 6 12 2 12" />
              </svg>
              <span className="sidebar-listItemText">Activity</span>
            </a>
          </li>
          <li className="sidebar-listItem">
            <a>
              <svg
                xmlns="http://www.w3.org/2000/svg"
                viewBox="0 0 24 24"
                fill="none"
                stroke="currentColor"
                stroke-width="2"
                stroke-linecap="round"
                stroke-linejoin="round"
                className="sidebar-listIcon"
              >
                <circle cx="12" cy="12" r="3" />
                <path d="M19.4 15a1.65 1.65 0 00.33 1.82l.06.06a2 2 0 010 2.83 2 2 0 01-2.83 0l-.06-.06a1.65 1.65 0 00-1.82-.33 1.65 1.65 0 00-1 1.51V21a2 2 0 01-2 2 2 2 0 01-2-2v-.09A1.65 1.65 0 009 19.4a1.65 1.65 0 00-1.82.33l-.06.06a2 2 0 01-2.83 0 2 2 0 010-2.83l.06-.06a1.65 1.65 0 00.33-1.82 1.65 1.65 0 00-1.51-1H3a2 2 0 01-2-2 2 2 0 012-2h.09A1.65 1.65 0 004.6 9a1.65 1.65 0 00-.33-1.82l-.06-.06a2 2 0 010-2.83 2 2 0 012.83 0l.06.06a1.65 1.65 0 001.82.33H9a1.65 1.65 0 001-1.51V3a2 2 0 012-2 2 2 0 012 2v.09a1.65 1.65 0 001 1.51 1.65 1.65 0 001.82-.33l.06-.06a2 2 0 012.83 0 2 2 0 010 2.83l-.06.06a1.65 1.65 0 00-.33 1.82V9a1.65 1.65 0 001.51 1H21a2 2 0 012 2 2 2 0 01-2 2h-.09a1.65 1.65 0 00-1.51 1z" />
              </svg>
              <span className="sidebar-listItemText">Settings</span>
            </a>
          </li>
        </ul>
        <div className="sidebar-profileSection">
          <img
            src="https://assets.codepen.io/3306515/i-know.jpg"
            width="40"
            height="40"
            alt="Monica Geller"
          />
          <span>Monica Geller</span>
        </div>
      </div>
    </div>
  );
};

ReactDOM.render(<Sidebar />, document.getElementById("root"));

              
            
!
999px

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