style.css

@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300&display=swap');

/* reset browser default */
* {
  margin: 0;
  padding: 0;
}

/* added @import google font family to entire document body*/
body {
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 15px;
  font-family: 'Poppins', sans-serif;
  padding: 15px;
  margin: 20px;
  background: #eee;
}

section {
  background-color: white;
  border-radius: 10px;
  box-shadow: 5px 5px 20px #f2f2f2;
}

.header {
  text-align: center;
  color: #fff;
  border-radius: 10px 10px 0px 0px;
  background: #00a693;
}

.euro-sign-top {
  background-color: #eee;
  padding: 0.5em;
}

div {
  padding: 1em;
}

/* Customize input and select default style */
input,
select {
  font-family: 'Poppins', sans-serif;
  width: 70%;
  appearance: none;
  outline: none;
  border: none;
  border-bottom: 2px #66ffff groove;
  margin-top: 1em;
  padding: 0.5em;
}

button {
  padding: 1em;
  background: #00a693;
  color: white;
  border: none;
  width: 100%;
}

.btn,
.final-message {
  text-align: center;
}