JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" class="um" />
<input type="text" class="dois" />

CSS

input {
  width: 250px;
}

@media (max-width: 600px) {
  input {
    display: block;
    width: 100%;
  }
  .um {
    background: red;
  }
  .dois {
    background: blue;
  }
}