ckground-color: blue;
  }

  .longbox {
    display: inline-block;
    width: 175px;
    height: 25px;
    background-color: blue;
  }
  </style>

  <main class="container">
    <div class="shape"></div>
    <div class="shape"></div>
    <div class="longbox"></div> <!-- Saturate the margin space -->
    <div class="longbox"></div> <!-- Saturate the border space -->
    <div class="longbox"></div> <!-- Saturate the padding space -->
    <div class="box"></div>
    <div class="longbox"></div> <!-- Saturate th