JSFiddle - React, Tailwind, and code Playground

HTML

<body>

  <div class="container">
    <div class="autosuggest">
      <input class="input" type="text" value="input">
    </div>
    <div class="content">
      content content content content content content content content content content
    </div>
  </div>
  
  <div class="container">
    <div class="autosuggest">
      <input class="input" type="text" value="input">
      <ul class="suggestions">
        <li>suggestion 1</li>
        <li>suggestion 2</li>
        <li>suggestion 3</li>
        <li>suggestion 4</li>
        <li>suggestion 5</li>
        <li>suggestion 6</li>
        <li>suggestion 7</li>
        <li>suggestion 8</li>
        <li>suggestion 9</li>
      </ul>
    </div>
    <div class="content">
      content content content content content content content content content content
    </div>
  </div>
  
</body>

CSS

.container {
  height: 100px;
  width: 300px;
  margin-top: 50px;
  overflow-y: auto;
  border: 1px solid black;
}
.autosuggest {
  position: relative;
  width: 250px;
}
.input {
  font-size: 16px;
  width: 230px;
  padding: 5px 10px;
  border: 0;
  background-color: #FFEBBF;
}
.suggestions {
  list-style-type: none;
  margin: 0;
  padding: 5px 10px;
  width: 230px;
  background-color: #85DDFF;
  position: absolute;
  display: none;
}
.input:focus + .suggestions {
  position: fixed;
  display: block;
}
.content {
  width: 120px;
  padding: 5px 10px;
}