body{
  font-family: verdana, sans-serif;
}

h1{
  text-align: center;
}

#phone{
  background-color: #000000;
  width: 300px;
  height: 530px;
  border-radius: 10px;
  padding: 10px;
  margin-left: auto;
  margin-right: auto;
}

#screen{
  background-color: #bdd0e6;
  border-radius: 10px;
  height: 425px;
  margin-top: 10px;
}

#label{
  padding-top: 20px;
  text-align: center;
}

input[type="text"]{
  display: block;
  margin-left: auto;
  margin-right: auto;
  width: 70%;
  height: 50px;
  font-size: 20px;
  border-radius: 10px;
}

#results-div{
  padding-left: 10px;
  padding-right: 10px;
  font-size: 14px;
}

.btn-group{
  padding: 10px;
  height: 40px;
  width: 180px;
  margin-left: auto;
  margin-right: auto;
}
button{
  height: 100%;
  width: 80px;
}