.form__group {
  display: flex;
}

.form__group-item {
  height: 37px;
}

.form__amount-wrapper {
  margin-right: 1rem;
}

.form__group-item {
  flex: 1;
  position: relative;
}

.form__group-item:not(:last-of-type) {
  margin-right: 1rem;
}

.form__flex-group {
  display: flex;
}

.form__flex-item {
  flex: 1;
}

.form__footer {
  padding-top: 1.5rem;
  margin-bottom: 3rem;
}

.form__footer button {
  margin-bottom: .5rem;
}

.form__footer--right {
  text-align: right;
}

@media (max-width: 540px) {
  .form__group {
    flex-direction: column;
  }
  
  .form__group-item {
    margin-bottom: 1em;
    width: 100%;
  }
}