.form-inline {  
  display: flex;
  flex-flow: row wrap;
  align-items: center;
  
}

.form-inline label {
  margin: 5px 10px 5px 0;
  font-weight: bold;
  
}

.form-inline input {
  vertical-align: middle;
  margin: 5px 10px 5px 0;
  padding: 1rem;
  background-color: #fff;
  border: 1px solid #ddd;
}

.form-inline select {
  vertical-align: middle;
  margin: 5px 10px 5px 0;
  padding: 1rem;
  background-color: #fff;
  border: 1px solid #ddd;
}

.form-inline button {
  padding: 1rem 2rem;
  background-color: dodgerblue;
  border: 1px solid #ddd;
  color: white;
  cursor: pointer;
}

.form-inline button:hover {
  background-color: royalblue;
}

@media screen and (max-width: 835px) {
    
    
  .form-inline input {
      width:100%;
      text-align:center;
  }
    .form-inline select {
      width:100%;
      text-align:center;
  }
  
  .form-inline label {
    font-size:1rem;
    width:100%;
  }
  
  .form-inline {
    flex-direction: column;
    align-items: stretch;
  }

}