style.css

@import url("https://fonts.googleapis.com/css2?family=Roboto+Slab:wght@300;400;700&display=swap");

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

html {
  scroll-behavior: smooth;
}
body {
  overflow-x: hidden;
  font-family: "Roboto Slab", serif;
  background-color: #f2ece9;
}

h1,
h2,
h3 {
  font-weight: 700;
  margin: 20px 0;
}

h1 {
  color: #f2ece9;
  font-size: 28px;
}

h2 {
  font-size: 36px;
}

a {
  text-decoration: none;
  color: #b40d1a;
  transition: 0.5s;
}

a:hover {
  color: black;
  transition: 0.5;
  text-decoration: underline;
}

nav {
  background: rgb(180, 13, 26);
  background: linear-gradient(355deg, rgba(180, 13, 26, 1) 0%, rgba(203, 88, 92, 1) 50%, rgba(180, 13, 26, 1) 100%);
  position: fixed;
  top: 0;
  right: 0;
  left: 0;
  padding: 0 20px;
  display: flex;
  align-items: center;
}

.flag {
  width: 50px;
  height: 50px;
  margin-right: 10px;
  border-radius: 100%;
}

main {
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
}

#content {
  background-color: white;
  width: 80%;
  padding: 36px;
}

#result {
  width: 80%;
  padding: 36px;
}

label {
  display: block;
  font-weight: 700;
  font-size: 18px;
  margin: 20px 0 8px 0;
}

select {
  width: 300px;
  height: 18px;
  border-radius: 24px;
  padding: 10px;
  box-sizing: content-box;
  font-size: 16px;
  box-shadow: rgba(149, 157, 165, 0.2) 0px 8px 24px;
}

button {
  padding: 6px 36px;
  display: block;
  margin: 20px 0;
  border-radius: 6px;
  background-color: #b40d1a;
  border: 0px;
  font-size: 18px;
  font-weight: 700;
  color: #f2ece9;
  box-shadow: rgba(17, 12, 46, 0.15) 0px 48px 100px 0px;
  transition: 0.3s;
}

button:hover {
  background-color: #f2ece9;
  color: #b40d1a;
  cursor: pointer;
  transition: 0.3s;
}

footer {
  text-align: center;
  padding: 10px;
}

.result-content {
  width: 30%;
  margin: 20px 0;
}

#result-title {
  width: 100%;
  border-radius: 12px 12px 0px 0px;
  padding: 16px;
  background-color: lightgreen;
}
#result-desc {
  width: 100%;
  border-radius: 0 0 12px 12px;
  padding: 16px;
  background-color: rgb(209, 228, 209);
  box-shadow: rgba(17, 12, 46, 0.15) 0px 48px 100px 0px;
}

span#result-kode-pos {
  font-weight: 700;
  font-size: 18px;
}

.hidden {
  display: none;
}

.mt-100 {
  margin-top: 100px;
}

.green {
  background-color: lightgreen;
  color: black;
}