text-indent

Definition and Usage
The text-indent property specifies the indentation of the first line in a text-block.
Note: Negative values are allowed. The first line will be indented to the left if the value is negative.

div.a {
  text-indent: 50px;
}

div.b {
  text-indent: -2em;
}

div.c {
  text-indent: 30%;
}

text-blockは、最初の行のインデントのcssプロパティを設定します.