h1 {
  font-size: 50px;
}

h3 {
  display: inline;
  /*margin-left: 15px;
  margin-right: 15px;*/
}

.container {
  margin-top: 30px;
  width: 500px;
}
.result {
  font-weight: 900;
  font-size: 40px;
}

input {
  text-align: center;
  width: 75px !important;
  margin: 0 auto;
}

.form-control {
  margin-top: 5px;
  margin-bottom: 5px;
}


#article {
  padding:5% 10% 1%;
}