@charset "UTF-8";
@unknown {}

.a {
  color: #fff1az;

  /**/

  font-weight: 400;
  color: #fff;

  padding-left: 10px;
  padding: 20px;

  font-family: 'Times', Times, serif;

  font-family: Helvetica, Arial, Verdana, Tahoma;

  top: calc(1px +2px);

  background: linear-gradient(bottom, #fff, #000);
}

@keyframes important1 {
  from {
    margin-top: 50px;
  }
  to {
    margin-top: 100px !important;
  }
}

@media screen and (unknown) {
  .a {
    color: #fff;
  }
}

@import 'a.css';
@import 'a.css';

.a {
  background: #000;;
  colr: blue;
}
// css注释
.b:unknown {
  background: #000;
}
.b::unknown {
  background: #000;
}
unknown {
  content: "first
    second";
  width: 10pixels;
  background: #000
}