@media only screen and (min-width: 1100px) {
  #tax-back-form {
       min-height: 800px;
       min-width: 1080px;
  }
}

@media only screen and (min-width: 800px) and (max-width: 1099px) {
  #tax-back-form {
       min-height: 800px;
       min-width: 780px;
  }
}

@media only screen and (max-width: 799px) {
  #tax-back-form {
       min-height: 600px;
       max-width: 500px;
  }
}