.b_inputForm{
  padding:10px;
  font-size:18px;
  width:100%;
  max-width:420px;
  border:1px solid rgba(125,98,104,1);
  text-align:center;
  background-color:rgba(242,242,242,1);
  margin:5px 0;
  box-sizing:border-box;
}

#regform button{
  padding:16px;
  font-size:20px;
  width:100%;
  max-width:420px;
  border:2px solid rgba(210,210,210,1);
  text-align:center;
  background-color:rgba(125,98,104,1);
  color:rgba(242,242,242,1);
  margin:20px 0;
  box-sizing:border-box;
}

@media (max-width: 768px) {
  .b_inputForm,
  #regform button {
    max-width: 100%;
    font-size: 16px;
  }
  
  #regform button {
    padding: 14px;
  }
}