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


html {
    font-size: 62.5%; /* (62.5/100) * 16 = 10px
    */
    font-family: "Inter", sans-serif;
    font-weight: 400;
  }
  
  body {
    font-size: 1.6rem;
  }
  header {
    color: #fff;
    background-color: #728308;
    padding: 2rem;
    text-align: center;
  }

  header h1 {
    border: 0.8rem solid white;
    display: inline-block;
    padding: 0.6rem 1.2rem;
    border-radius: 3.6rem;
  }

  /* Navigation Links */

  nav {
    background-color: #f4f4f4;
  }

  /* Banner Image */
.banner img {
  width: 100%;
}

/* Navigation Links */

nav {
  background: #f4f4f4;
  padding: 2rem;
}

nav ul {
  display: flex;
  justify-content: space-between;
  list-style-type: none;
}

/* SECTION - BANNER */
.banner {
  position: relative;
}
/* Banner Image */
.banner img {
  /* To cover the entire section */
  display: block;
  width: 100%;
}

.banner .welcome {
  font-size: 6rem;
  padding: 3rem;
  position: absolute;
  left: 0;
  top: 30%;
  color: white;
  background-color: rgba(255, 255, 255, 0.5);
  border-radius: 10px;
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.5);
}

.banner .welcome span {
  font-size: 6rem;
  padding: 3rem;
  position: absolute;
  left: 0;
  top: 30%;
  color: white;
  background-color: rgba(255, 255, 255, 0.5);
  border-radius: 10px;
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.5);
}

.banner .welcome span {
  font-size: 1.5em;
}

/* Navigation Links */

nav {
  background: #f4f4f4;
}

nav ul {
  display: flex;
  justify-content: space-between;
  list-style-type: none;
  font-size: 2rem;
  padding: 2.5rem 6rem;
}

nav li a {
  text-decoration: none;
  color: #4b4b4b;
}

nav li a:hover {
  text-decoration: underline;
}

nav li a.join {
  color: #728308;
}

/* Main Section */

main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 4rem 2rem;
}

article h2 {
  color: #728308;
  font-size: 4.2rem;
  margin-bottom: 2rem;
}

article p {
  font-size: 1.8rem;
  line-height: 3rem;
  color: #4b4b4b;
}

article p::first-line {
  font-weight: 600;
  font-size: 2rem;
}

article p::selection {
  background: #728308;
  color: #fff;
}

/* SECTION - IMAGES */
section.images {
  text-align: center;
  padding: 4rem 0;
  background-attachment: fixed;
  background-image: url("https://i.ibb.co/NZYDg9K/ben10-background.png");
}

section.images img {
  width: 32rem;
  margin: 0 1rem;
  vertical-align: middle;
  transition: all 0.2s ease-in-out;
}

section.images img:hover {
  transform: scale(1.25);
}

/* Need to go back and make nav links sticky */

section.newsletter {
  background: #f4f4f4;
  text-align: center;
  padding: 60px 20px;
  color: #4b4b4b;
}

section.newsletter h2 {
  font-size: 3.4rem;
  margin: 2rem 0;
}

section.newsletter p {
  font-size: 2rem;
  margin: 2rem 0;
}

form input {
  background-color: #f8f9fa;
  margin: 2rem 0;
  padding: 1.2rem 2rem;
  font-size: 1.8rem;
  border-radius: 2.8rem;
  border: 4px solid #ced4da;
  outline: none;
}

form input:focus:valid {
  background-color: #f4fce3;
  border: 4px solid #a9e34b;
}

form input:focus:invalid:not(:placeholder-shown) {
  background-color: #fff5f5;
  border: 4px solid #ff8787;
}

/* FOOTER */
footer {
  background: #728308;
  color: white;
  padding: 4rem;
  font-size: 1.8rem;
  text-align: center;
}