styles.css

@import url('https://fonts.googleapis.com/css?family=Poppins:200,400,600&display=swap');

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  background-color: black;
  color: #f3f3f3;
  font-family: 'Poppins', sans-serif;
  font-weight: 400;
}

#background {
  height: 100%;
  background-image: url('https://www.freecodecamp.org/news/content/images/size/w2000/2022/03/photo-1619410283995-43d9134e7656.jpeg');
  background-position: center;
  filter: blur(5px);
  opacity: 0.25;
}

header {
  margin: 3rem 0;
}

#content {
  position: absolute;
  width: 100%;
  top: 0;
  left: 0;
}

h1 {
  font-size: 2em;
  letter-spacing: 2px;
}

h1,
p {
  text-align: center;
}

main {
  width: 80%;
  max-width: 768px;
  min-width: 420px;
  background: #0e1938bf;
  margin: 0 auto 2rem auto;
  border: 1px solid #ffffff;
  border-radius: 1rem;
}

form {
  margin: 0;
  padding: 2.5rem;
}

.form-group {
  margin-top: 30px;
}

.form-group:first-child {
  margin-top: 0px;
}

label {
  display: flex;
  font-size: 1.1em;
  margin-bottom: 5px;
  align-items: center;
  gap: 10px;
}

input,
select,
textarea {
  height: 2.2rem;
  border: 1px solid white;
  border-radius: 1rem;
  width: 100%;
  padding: 5px 10px;
  margin: 0;
  font-family: inherit;
  font-size: inherit;
}

input:focus,
textarea:focus {
  outline: 2px solid #82b3f1;
}

input[type='radio'],
input[type='checkbox'] {
  width: auto;
  width: 20px;
}

textarea {
  height: auto;
}

button {
  display: block;
  margin: 30px auto 0;
  width: 100%;
  padding: 1rem 0;
  border-radius: 1rem;
  background-color: #4eb374;
  border: 1px solid #4eb374;
  color: #f3f3f3;
  font-size: 1.1rem;
}

button:hover {
  background-color: #38664a;
  border: 1px solid #f3f3f3;
  cursor: pointer;
}