.js-practice {
  width: 500px;
  padding: 10px 80px 80px 80px;
  margin: auto;
  border-radius: 8px;
  box-shadow: 0px 0px 17px -11px black;
  margin-top: 200px;
  background-color: rgba(0, 255, 255, 0.116);
  font-family: Verdana, Geneva, Tahoma, sans-serif;
}

h2 {
  text-align: center;
  font-size: 30px;
}

hr {
  margin-bottom: 60px;
  width: 250px;
  text-align: center;
}

.result-sheet {
  display: flex;
  align-items: center;
  justify-content: space-between;
  align-content: center;
}

#number {
  padding: 10px;
  margin-bottom: 10px;
  font-size: 20px;
  border-radius: 8px;
  outline: 0;
  border: 1px solid black;
  background-color: rgb(255, 255, 255);
}

.result {
  background-color: rgb(255, 255, 255);
  padding: 20px;
  border-radius: 8px;
  font-size: 30px;

}

.btn {
  padding: 10px 15px;
  font-size: 20px;
  outline: 0;
  border: 1px solid black;
  border-radius: 8px;
  background-color: rgb(255, 255, 255);
}

.btn:hover {
  border: 1px solid rgb(255, 255, 255);
  background-color: rgba(0, 255, 255, 0.116);
}