<div class="container" id="container">
  <header>
    <section class="window--buttons">
      <div class="window__close"></div>

      <div class="window__minimize"></div>

      <div class="window__maximize"></div>
    </section>
  </header>

  <aside>
    <div>
      <input type="text" placeholder="Search" /><br />

      <button class="active" id="sidebar-btn">Discover</button>
      <button id="sidebar-btn">Arcade</button>
      <button id="sidebar-btn">Create</button>
      <button id="sidebar-btn">Work</button>
      <button id="sidebar-btn">Play</button>
      <button id="sidebar-btn">Develop</button>
      <button id="sidebar-btn">Categories</button>
      <button id="sidebar-btn">Updates</button>
    </div>

    <div class="profile">
      <img src="https://pbs.twimg.com/profile_images/994592419705274369/RLplF55e.jpg" alt="Profile Pic" class="profile--pic" />

      <h1>Jimmy Donaldson</h1>
    </div>
  </aside>

  <div class="content">
    <div class="ideas">
      <div class="idea">
        <p>MASTER YOUR MAC</p>
        <h1>Make a great<br> handoff</h1>
        <p>Work seamlessly across devices</p>
      </div>

      <div class="idea">
        <p>GET STARTED</p>
        <h1>Apps optimised for mac with M1</h1>
        <p>Work seamlessly across devices</p>
      </div>
    </div>

    <section class="updates">
      <h1>Updates</h1>

      <div class="update update-1">

        <div class="updt-left">
          <img src="https://img.icons8.com/color/452/microsoft-powerpoint-2019.png" alt="powerpoint icon" />
          <h1>Microsoft Powerpoint</h1>
        </div>

        <div class="buttons">
          <a href="https://bit.ly/3gdGvT8" target="_warning">
            <button>Update</button>
          </a>
        </div>
      </div>

      <div class="update">

        <div class="updt-left">
          <img src="https://img.icons8.com/color/452/microsoft-word-2019--v2.png" alt="word icon" />
          <h1>Microsoft Word</h1>
        </div>

        <div class="buttons">
          <button style="color: lime;cursor: default">Updated</button>
        </div>
      </div>

      <div class="update">

        <div class="updt-left">
          <img src="https://upload.wikimedia.org/wikipedia/commons/thumb/b/b6/Adobe_Photoshop_Lightroom_CC_logo.svg/788px-Adobe_Photoshop_Lightroom_CC_logo.svg.png" alt="lightroom icon" />
          <h1>Adobe Lightroom</h1>
        </div>

        <div class="buttons">
          <a href="https://bit.ly/3gdGvT8" target="_warning">
            <button>Update</button>
          </a>
        </div>
      </div>

      <div class="update">

        <div class="updt-left">
          <img src="https://upload.wikimedia.org/wikipedia/en/5/56/Xcode_14_icon.png" alt="xcode icon" />
          <h1>Xcode</h1>
        </div>

        <div class="buttons">
          <a href="https://bit.ly/3gdGvT8" target="_warning">
            <button>Update</button>
          </a>
        </div>
      </div>
    </section>

    <section class="trending">
      <h1>Trending</h1>

      <div class="grid">
        <span class="grid__app">
          <h1>Kindle</h1>

          <button>GET</button>
        </span>

        <span class="grid__app">
          <h1>Slac</h1>

          <button>GET</button>
        </span>

        <span class="grid__app">
          <h1>Magnet</h1>

          <button>₹699</button>
        </span>

        <span class="grid__app">
          <h1>CotEditor</h1>

          <button>GET</button>
        </span>

        <span class="grid__app margin">
          <h1>Twitter</h1>

          <button>GET</button>
        </span>

        <span class="grid__app margin">
          <h1>Notability</h1>

          <button>₹799</button>
        </span>

        <span class="grid__app margin">
          <h1>NDTV</h1>

          <button>GET</button>
        </span>

        <span class="grid__app margin">
          <h1>Rummy</h1>

          <button>₹179</button>
        </span>
      </div>
    </section>

    <section class="links">
      <a href="#">Privacy Policy -></a>

      <a href="#">Terms and Conditions -></a>

      <a href="#">Report Error -></a>

      <a href="#">
        Parent's guide to Mac app store
      </a>
    </section>
  </div>

</div>
@import url("https://fonts.googleapis.com/css2?family=Poppins:wght@200;300;400;500;600;700&display=swap");
* {
  margin: 0;
  box-sizing: border-box;
  user-select: none;
}

html {
  font-size: 62.5%;
}

:root {
  --container-height: 90%;
  --container-width: 90%;
  --component-background: rgba(0, 0, 0, 0.45);
}

body {
  background: url("https://4kwallpapers.com/images/wallpapers/macos-big-sur-apple-layers-fluidic-colorful-dark-wwdc-2020-3840x2160-1432.jpg");
  background-size: cover;
  background-attachment: fixed;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;

  font-family: "Poppins", sans-serif;
}

@mixin windowButton($color) {
  width: 1.5rem;
  height: 1.5rem;
  background: $color;
  display: inline-block;
  border-radius: 50%;
  transition: 0.3s ease;
  &:hover {
    transform: scale(1.2);
  }
}

.container {
  background: rgba(0, 0, 0, 0.2);
  transition: 0.3s ease;
  backdrop-filter: blur(30px);
  border-radius: 15px;
  width: var(--container-width);
  height: var(--container-height);
  position: relative;
}

header {
  display: flex;
  justify-content: space-between;
  width: 100%;
  height: 30px;
  position: relative;
}

section.window--buttons {
  position: absolute;
  top: 15px;
  left: 15px;
  .window__close {
    @include windowButton(#f00);
  }

  .window__minimize {
    margin-left: 5px;
    @include windowButton(#f57c00);
  }

  .window__maximize {
    margin-left: 5px;
    @include windowButton(#4caf50);
  }
}

aside {
  overflow: scroll;
  height: 90%;
  margin-top: 20px;
  float: left;
  width: 200px;
  position: sticky;
  top: 0;
  button {
    display: block;
    margin-top: 7px;
    margin-left: 15px;
    padding: 0.7rem 4rem;
    font-family: "Poppins", sans-serif;
    font-size: 1.5rem;
    background: none;
    width: 170px;
    border-radius: 10px;
    border: 0;
    color: white;
    transition: 0.2s ease;
    cursor: pointer;
    &:hover {
      background: rgba(0, 0, 0, 0.55);
      backdrop-filter: blur(20px);
    }
    &.active {
      background: rgba(0, 0, 0, 0.55);
      backdrop-filter: blur(20px);
    }
  }
  input[type="text"] {
    font-size: 1.5rem;
    width: 170px;
    margin-left: 15px;
    padding: 0.9rem;
    border-radius: 10px;
    background: #000;
    color: #fff;
    font-family: "Poppins", sans-serif;
    border: 0;
    outline: 0;
    text-align: center;
    transition: 0.3s ease;

    background: rgba(0, 0, 0, 0.05);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.18);
    color: white;

    &::-webkit-input-placeholder {
      text-align: center;
    }

    &:-moz-placeholder {
      /* Firefox 18- */
      text-align: center;
    }

    &::-moz-placeholder {
      /* Firefox 19+ */
      text-align: center;
    }

    &:-ms-input-placeholder {
      text-align: center;
    }
  }
  .profile {
    position: absolute;
    left: 15px;
    display: flex;
    bottom: 15px;
    align-items: center;
    .profile--pic {
      width: 4rem;
      border-radius: 50%;
    }
    h1 {
      color: #fff;
      font-weight: 400;
      margin-left: 10px;
      font-size: 1.3rem;
    }
  }
}

.content {
  color: white;
  padding: 15px;
  border-radius: 30px;
  height: 90%;
  margin-right: 20px;
  overflow: scroll;
  .ideas {
    display: flex;
    .idea {
      background: var(--component-background);
      width: 50%;
      padding: 20px;
      border-radius: 20px;
      backdrop-filter: blur(20px);
      transition: 0.3s ease;
      &:nth-of-type(2) {
        margin-left: 15px;
      }
      p {
        color: gray;
        font-size: 1.2rem;
      }
      &:hover {
        transform: scale(1.06);
      }
    }
  }

  .updates {
    margin-top: 20px;
    h1:nth-of-type(1) {
      font-size: 2.2rem;
    }

    .update {
      width: 100%;
      background: var(--component-background);
      padding: 1.3rem 0.7rem;
      border-radius: 10px;
      margin-top: 10px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      transition: 0.4s ease;
      &:hover {
        transform: scale(1.03);
      }
      .updt-left {
        display: flex;
        align-items: center;
        h1 {
          font-size: 1.7rem;
          margin-left: 10px;
        }

        img {
          width: 35px;
        }
      }

      .buttons {
        button {
          background: none;
          color: dodgerblue;
          border: 0;
          font-size: 1.6rem;
          transition: 0.2s ease;
          cursor: pointer;
          font-family: "Poppins", sans-serif;
          &:hover {
            color: blue;
          }
        }
      }
    }
  }

  .trending {
    margin-top: 20px;
    h1:nth-last-of-type(1) {
      font-size: 2.2rem;
    }

    .grid {
      display: grid;
      grid-template-rows: repeat(4, 25%);
      grid-template-columns: 25% 25% 25% 25%;
      margin-top: 10px;
      gap: 5px;
      .grid__app {
        background: var(--component-background);
        padding: 13px;
        display: inline-block;
        display: flex;
        height: fit-content;
        border-radius: 10px;
        justify-content: space-between;
        &.margin {
          margin-top: 20px;
        }
        h1 {
          font-size: 1.7rem;
        }
        button {
          background: dodgerblue;
          color: #fff;
          border: 0;
          outline: 0;
          border-radius: 30px;
          width: 30%;
          cursor: pointer;
        }
      }
    }
  }

  .links {
    display: grid;
    grid-template-columns: repeat(2, 50%);
    grid-template-rows: repeat(2, 50%);
    a {
      text-align: center;
      color: #fff;
      font-size: 1.4rem;
      &:nth-of-type(3),
      &:nth-of-type(4) {
        margin-top: 7px;
      }
    }
  }
}

@media (max-width: 768px) {
  .content .trending .grid {
    grid-template-columns: repeat(2, 50%);
    grid-template-rows: repeat(4, 25%);
  }
  aside {
    display: none;
  }

  .links {
    margin-top: 50px;
    display: flex;
    flex-direction: column;
  }
}
View Compiled
//THIS APP IS NOT THE EXACT COPY OF THE APP STORE BUT IS SIMILAR TO IT ;).... and btw inspired by Aysenur Turk's pen (who i follow A LOT).

const side_bar_btns = document.querySelectorAll("#sidebar-btn");

side_bar_btns.forEach((elem) => {
  elem.addEventListener("click", () => {
    for (let index = 0; index < side_bar_btns.length; index++) {
      side_bar_btns[index].classList.remove("active");
    }
    elem.classList.add("active");
  });
});

let min = true;

document.querySelector(".window__close").addEventListener("click", () => {
  document.querySelector(".container").style.display = "none";

  setTimeout(() => {
    window.alert(
      "Oh No! What did you do? Now you have to refresh to open the app again"
    );
  }, 500);
});

document.querySelector(".window__maximize").addEventListener("click", () => {
  if (min == false) {
    min = true;
    console.log(min);
    document.querySelector(".container").style.width = "90%";
    document.querySelector(".container").style.height = "90%";
  } else {
    min = false;
    document.querySelector(".container").style.width = "100%";
    document.querySelector(".container").style.height = "100%";
  }
});

document.querySelector(".window__minimize").addEventListener("click", () => {
  console.log("hello world");

  document.querySelector(".container").style.transform = "scale(0)";

  setTimeout(() => {
    window.alert(
      "The app is minimized but cannot be opened again because the virtual codepen macos crashed!"
    );
  }, 500);
});

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

  1. https://cdnjs.cloudflare.com/ajax/libs/jquery/3.6.0/jquery.min.js