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.login-wrap {
  position: fixed;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  text-align: center;
  &:after {
    display: inline-block;
    width: 0;
    height: 100%;
    vertical-align: middle;
    content: '';
  }
  .login-form {
    text-align: left;
    display: inline-block;
    vertical-align: middle;
  }
}