#regForm {
  background-color: #ffffff;
  margin: 100px auto;
  font-family: Raleway;
  padding: 40px;
  width: 100%;
  min-width: 300px;
}


/* Mark input boxes that gets an error on validation: */
input.invalid {
  background-color: #ffdddd;
}

/* Hide all steps by default: */
.tab {
  display: none;
}

.button_a {
  background-color: #4CAF50;
  color: #ffffff;
  border: none;
  padding: 10px 20px;
  font-size: 17px;
  font-family: Raleway;
  cursor: pointer;
}

.button_a:hover {
  opacity: 0.8;
}

#prevBtn_a {
  background-color: #bbbbbb;
}

/* Make circles that indicate the steps of the form: */
.step {
  padding: 10px;
  min-width:100px;
  margin: 0 20px;
  background-color: #bbbbbb;
  border: none;  

  display: inline-block;
}

.step.active {
  opacity: 1;
}

/* Mark the steps that are finished and valid: */
.step.finish {
  background-color: #4CAF50;
}