#inputA_1 {
  width: 74px;
}

#inputA_2 {
  width: 74px;
}

#btnMethod_1,
#btnClear_1 {
  width: 66px
}

/* *************** 640px *************** */
@media only screen and (max-width: 640px) {

  .selectParams {
    display: flex;
    flex-direction: row;
    justify-content: flex-start;
    text-align: center;
  }
}