style.css

@import url('https://fonts.googleapis.com/css2?family=New+Tegomin&display=swap');

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background-color: #1687a7;
  height: 100vh;
  display: flex;
  align-items: center;
  font-family: 'New Tegomin', serif;
}

section {
  margin: auto;
  width: 500px;
  background-color: #11698e;
  padding: 2%;
  border-radius: 25px;
  color: #f8f1f1;
  border: 5px solid #19456b;
  line-height: 1.8em;
  font-size: 1.5em;
}

.hidden {
  display: none;
}

h1 {
  text-align: center;
  margin-bottom: 5%;
}

input {
  text-align: right;
  width: 20%;
  float: right;
  outline: none;
  font-size: 1.1em;
  border: none;
  color: #19456b;
  font-family: 'New Tegomin';
}

button {
  float: right;
  padding-top: 2%;
  padding-bottom: 2%;
  width: 20%;
  border: none;
  background-color: #16c79a;
  outline: none;
  color: #19456b;
  font-size: 70%;
  font-weight: bolder;
}

button:hover {
  cursor: pointer;
}