* {
  box-sizing: border-box;
  font-family: 'Roboto';
}
.tab {
  display: none;
  width: 100%;
  height: 50%;
  margin: 0px auto;
}
.current {
  display: block;
}

form {
  background-color: #ffffff;
  margin: 50px auto;
  padding: 40px;
  width: 40%;
  min-width: 300px;
  box-shadow: rgba(149, 157, 165, 0.2) 0px 8px 24px;
}

input {
  padding: 10px;
  width: 100%;
  font-size: 17px;
  border: 1px solid #aaaaaa;
}

button {
  background-color: #1fcfb1;
  color: #ffffff;
  border: none;
  padding: 10px 20px;
  font-size: 17px;
  cursor: pointer;
  transition: 0.3s;
}
button:hover {
  opacity: 0.8;
  background-color: #0bceaf;
}

.previous {
  background-color: #bbbbbb;
}

/* Make circles that indicate the steps of the form: */
.step {
  height: 30px;
  width: 30px;
  cursor: pointer;
  margin: 0 2px;
  color: #fff;
  background-color: #bbbbbb;
  border: none;
  border-radius: 50%;
  display: inline-block;
  opacity: 0.8;
  padding: 5px;
}

.step.active {
  opacity: 1;
  background-color: #69c769;
}

.step.finish {
  background-color: #4caf50;
}

.error {
  color: #f00;
}