'Different behaviour with ems and rems in Safari and Chrome

In Chrome

When I decrease the font-size of .box then .inner-box scales down accordingly until 0rem (where .inner-box is completely gone).

In Safari

When I decrease the font-size of .box then .inner-box scales down accordingly until it hits exactly 0.6rem and then it stops scaling.

Can anyone explain this behaviour?

body {
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

.box {
  font-size: 2rem;
}

.inner-box {
  margin: auto;
  height: 10em;
  width: 20em;
  background: tomato
}
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <div class="box">
    <div class="inner-box"></div>
  </div>
</body>
htmlcss


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