style.css

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
:root {
  font-size: 62.5%;
}
body {
  background: linear-gradient(287.56deg, #28ac07 0%, #19d351 100%);
  font-size: 1.6rem;

  display: grid;
  place-items: center;
  height: 100vh;
}

body,
button,
input,
span {
  font-family: 'DM Sans', sans-serif;
}

button {
  background: #28ac07;
  color: #fff;
  border-radius: 0 0.4rem 0.4rem 0;

  cursor: pointer;
  transition: background 0.3s ease;
}

button:hover {
  background: #176603;
}

.hide {
  display: none;
}

main {
  background: #ffffff;
  box-shadow: 0 0.2rem 0.4rem rgba(0, 0, 0.1);
  border-radius: 0.6rem;
  padding: 4.8rem 6.4rem 6.4rem;

  width: min(46.8rem, 90%);
  margin-top: -12rem;
  text-align: center;
}

/*Screen-one*/

h1 {
  font-family: 'Montserrat', sans-serif;
  font-size: 2.4rem;
  margin-bottom: 1.6rem;
}

h1,
p {
  color: #34355b;
}

p {
  opacity: 0.8;
}

form {
  margin-top: 4.8rem;
  display: flex;
  justify-content: center;
}

input,
button {
  border: none;
  padding: 1.6rem;
  font-weight: bold;
  font-size: 1.8rem;
}

input {
  background-color: #034d19;
  width: 5rem;
  color: #fff;
  text-align: center;
  border-radius: 0.4rem 0 0 0.4rem;
}

/*Screen-two*/

h2 {
  font-size: 2.4rem;
  font-weight: normal;

  margin-bottom: 3.3rem;
}

.screen-two button {
  border-radius: 0.4rem;
}