style text inside textarea

You can use CSS padding property:

textarea {
    padding: 5px;
}

textarea {
padding: 5px;
box-sizing: border-box;
}

NOTE: box-sizing is CSS3 property. It's very useful, because without it width: 100% or other will not work as you expected.

You can use CSS to create the desired effect

textarea {
  padding: 20px;
  margin: 10px;
}

<textarea></textarea>