body {
  font-family: 'Century Gothic';
  background-color: #efefef;
  padding-top: 30px;
}
.calculator {
  background-color: #dedede;
  padding: 10px;
  margin: 20px auto;
  width: 320px;
}
.calculator label,
.calculator input,
.calculator select {
  width: 300px;
  display: inline-block;
  margin: 5px 0;
  font-size: 20px;
}
.calculator input,
.calculator select {
  display: inline-block;
  float: none;
  font-size: 25px;
}
.calculator .result {
  width: 290px;
  font-size: 35px;
  margin-top: 10px;
}
.calculator .result:before {
  content: "Result: $";
}
.calculator .title {
  font-size: 30px;
  margin-bottom: 5px;
}


.article {
  padding: 5% 20% 0;
}