body {
  background-color: #ecf0f3;
}
h1 {
  font-family: Arial, Helvetica, sans-serif;
  text-align: center;
  font-size: 50px;
  text-decoration: underline steelblue;
  color: royalblue;
}
.container {
  width: 230px;
  background-color: #ecf0f3;
  margin: 60px auto 0px;
  text-align: center;
  border-radius: 20px;
  padding: 10px 0px;
  box-shadow: inset 5px 5px 12px #ffffff, 5px 5px 12px rgba(0, 0, 0, 0.16);
}
#input {
  width: 80%;
  height: 40px;
  background-color: #ecf0f3;
  border: none;
  border-radius: 50px;
  margin: 20px 0px 10px;
  padding: 0px 10px;
  font-size: 20px;
  outline: none;
  box-shadow: inset 5px 5px 12px #ffffff, 5px 5px 12px rgba(0, 0, 0, 0.16);
}
.btn {
  width: 36px;
  height: 34px;
  border-radius: 50px;
  margin: 5px;
  font-weight: bold;
  border: none;
  background-color: #ecf0f3;
  box-shadow: inset 5px 5px 12px #ffffff, 5px 5px 12px rgba(0, 0, 0, 0.16);
}
.equalBtn {
    width: 84px;
    height: 35px;
    border-radius: 50px;
    margin: 5px;
    font-weight: bold;
    border: none;
    background-color: #ecf0f3;
    box-shadow: inset 5px 5px 12px #ffffff, 5px 5px 12px rgba(0, 0, 0, 0.16);
}