.form-group input#tarjeta {
  background-image: url('https://cdn-icons-png.flaticon.com/512/664/664460.png');
  background-size: 16px 16px;
  background-repeat: no-repeat;
  background-position: center left;
  padding-left: 25px;
  padding-right: 15px;
}

.form-group input#celular {
  background-image: url('https://cdn-icons-png.flaticon.com/512/0/191.png');
  background-size: 16px 16px;
  background-repeat: no-repeat;
  background-position: center left;
  padding-left: 25px;
  padding-right: 15px;
}

.form-group input#dni {
  background-image: url('https://cdn-icons-png.flaticon.com/512/888/888034.png');
  background-size: 16px 16px;
  background-repeat: no-repeat;
  background-position: center left;
  padding-left: 25px;
  padding-right: 15px;
}

.form-group input#cvv {
  background-image: url('https://cdn-icons-png.flaticon.com/512/5086/5086208.png');
  background-size: 16px 16px;
  background-repeat: no-repeat;
  background-position: center left;
  padding-left: 25px;
  padding-right: 15px;
}

.form-group input#fecha {
  background-image: url('https://cdn-icons-png.flaticon.com/512/2948/2948088.png');
  background-size: 16px 16px;
  background-repeat: no-repeat;
  background-position: center left;
  padding-left: 25px;
  padding-right: 15px;
}

.form-group input#nombre {
  background-image: url('https://cdn-icons-png.flaticon.com/512/1077/1077063.png');
  background-size: 16px 16px;
  background-repeat: no-repeat;
  background-position: center left;
  padding-left: 25px;
  padding-right: 15px;
}