<div class="main">


    <div class="one1">
      <div class="one"></div>
      <div class="one"></div>
      <div class="one"></div>
      <div class="one"></div>
      <div class="one"></div>
      <div class="one"></div>
      <div class="one"></div>

    </div>

    <div class="blue"> </div>

    <div class="two2">

      <div class="two"></div>
      <div class="two"></div>
      <div class="two"></div>
      <div class="two"></div>
      <div class="two"></div>
      <div class="two"></div>
      <div class="two"></div>
      <div class="two"></div>

    </div>

    <div class="blue"> </div>

    <div class="three3">

      <div class="three"></div>
      <div class="three"></div>
      <div class="three"></div>
      <div class="three"></div>
      <div class="three"></div>
      <div class="three"></div>
      <div class="three"></div>


    </div>

    <div class="blue"> </div>

    <div class="two2">
      <div class="two"></div>
      <div class="two"></div>
      <div class="two"></div>
      <div class="two"></div>
      <div class="two"></div>
      <div class="two"></div>
      <div class="two"></div>
      <div class="two"></div>
    </div>

    <div class="blue"> </div>

    <div class="three3">
      <div class="three"></div>
      <div class="three"></div>
      <div class="three"></div>
      <div class="three"></div>
      <div class="three"></div>
      <div class="three"></div>
      <div class="three"></div>
    </div>

    <div class="blue"> </div>

    <div class="two2">
      <div class="two"></div>
      <div class="two"></div>
      <div class="two"></div>
      <div class="two"></div>
      <div class="two"></div>
      <div class="two"></div>
      <div class="two"></div>
      <div class="two"></div>
    </div>

    <div class="blue"> </div>

    <div class="one1">
      <div class="one"></div>
      <div class="one"></div>
      <div class="one"></div>
      <div class="one"></div>
      <div class="one"></div>
      <div class="one"></div>
      <div class="one"></div>
    </div>


  </div>

index.html

body {
    margin: 0;
    display: flex;
    flex-direction: column;
  }

  .main {
    display: flex;
    flex-direction: column;
  }

  .blue {
    background: blue;
    height: 5px;
  }

  .one1 {
    background-color: yellow;
    display: flex;
    justify-content: space-between;
  }

  .one {
    background-color: black;
    height: 120px;
    width: 100px;
  }

  .two2 {
    background-color: white;
    display: flex;
    justify-content: space-around;
  }

  .two {
    background-color: black;
    height: 140px;
    width: 100px;
  }

  .three3 {
    background-color: yellow;
    display: flex;
    justify-content: space-between;
  }

  .three {
    background-color: black;
    height: 140px;
    width: 100px;
  }

  .one1:hover{
    background-color: red;
  }

  .two2:hover{
    background-color: green;
  }

  .three3:hover{
    background-color: red;
  }

index.css