*{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family:'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
}
body{
  background: rgb(87, 162, 165);
  text-align: center;
  padding: 40px;
}
.container{
  background: #fff;
  padding: 20px 30px;
  margin: 10px;
  border-radius: 7px;
  box-shadow: 0 0  10px rgba(0,0,0,0.2);
  display: inline-block;
}
h1{
  margin-bottom: 10px;
  color: rgb(43, 132, 135);
}
span{
  font-size: 25px;
}
.btn-group{
  margin-top: 20px;
}
button{
  padding: 10px 20px;
  margin: 10px;
  font-size: 16px;
  cursor: pointer;
  border: none;
  outline: none;
  background: rgb(14, 156, 161);
  color: #fff;
  font-weight: 600;
}
button:hover{
  background: rgb(15, 104, 107);
}
#output{
  margin-top: 10px;
  padding: 20px;
  color: rgb(14, 133, 137);
  border-radius: 8px;
}