JSFiddle - React, Tailwind, and code Playground

HTML

<body>
<h1>Our Menu</h1>

<div class="row">
  <section id="box", class="col-lg-4 col-md-6">
    <div id="content", class="topcorner"><div id='text'>Item 1</div></div>
  </section>
  <section class="col-lg-4 col-md-6">Item 2</section>
  <section class="col-lg-4 col-md-12">Item 3</section>
</div>

</body>

CSS

* {
  box-sizing: border-box;
}
h1 {
  margin-bottom: 15px;
  text-align: center;
}

section {
  border: 1px solid black;
  background-color: #A52A2A;
  width: 90%;
  height: 150px;
  margin-right: auto;
  margin-left: auto;
  font-family: Helvetica;
  color: white;
  position: relative;
}

/* Simple Responsive Framework. */
.row {
  width: 100%;
}

/********** Large devices only **********/
@media (min-width: 992px) {
  .col-lg-1, .col-lg-2, .col-lg-3, .col-lg-4, .col-lg-5, .col-lg-6, .col-lg-7, .col-lg-8, .col-lg-9, .col-lg-10, .col-lg-11, .col-lg-12 {
    float: left;
    border: 1px solid green;
  }
  .col-lg-1 {
    width: 8.33%;
  }
  .col-lg-2 {
    width: 16.66%;
  }
  .col-lg-3 {
    width: 25%;
  }
  .col-lg-4 {
    width: 33.33%;
  }
  .col-lg-5 {
    width: 41.66%;
  }
  .col-lg-6 {
    width: 50%;
  }
  .col-lg-7 {
    width: 58.33%;
  }
  .col-lg-8 {
    width: 66.66%;
  }
  .col-lg-9 {
    width: 74.99%;
  }
  .col-lg-10 {
    width: 83.33%;
  }
  .col-lg-11 {
    width: 91.66%;
  }
  .col-lg-12 {
    width: 100%;
  }
}

/********** Medium devices only **********/
@media (min-width: 768px) and (max-width: 991px) {
  .col-md-1, .col-md-2, .col-md-3, .col-md-4, .col-md-5, .col-md-6, .col-md-7, .col-md-8, .col-md-9, .col-md-10, .col-md-11, .col-md-12 {
    float: left;
    border: 1px solid green;
  }
  .col-md-1 {
    width: 8.33%;
  }
  .col-md-2 {
    width: 16.66%;
  }
  .col-md-3 {
    width: 25%;
  }
  .col-md-4 {
    width: 33.33%;
  }
  .col-md-5 {
    width: 41.66%;
  }
  .col-md-6 {
    width: 50%;
  }
  .col-md-7 {
    width: 58.33%;
  }
  .col-md-8 {
    width: 66.66%;
  }
  .col-md-9 {
    width: 74.99%;
  }
  .col-md-10 {
    width: 83.33%;
  }
  .col-md-11 {
    width: 91.66%;
  }
  .col-md-12 {
    width: 100%;
  }
}

#box {
  background-color: blue;
  padding: 10px;
  border: 2px solid black;
  margin-top: 10px;
}

#content {
  width: 20%;

  background-color: #90EE90; /* green */
}

.topcorner {
  position: absolute;
  top:0;
 ...