html, body {
  padding: 0;
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
}
h1 {
  color: #333;
  text-align: center;
  font-size: 3em;
}
ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: #333;
}

li {
   float: left; 
}

li a {
  display: block;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

li a:hover {
  background-color: #111;
}
main {
    text-align: center;
}
form {
  background-color: rgb(199, 211, 207);
  width: 50%;
  display: inline-block;
  padding: 2em;
  border: dashed 3px #333;
  border-radius: 0.5;
  margin-bottom: 2em;
}
form input {
  width: 80%;
  font-size: 1.5em;
  padding: 0.2em;
}
#btn {
  width: 100px;
  background-color: crimson;
  color: white;
  border: none;
  font-size: 1.5em;
  padding: 0.2em;
  margin: 1.5em;
}
#btn:hover {
  background-color: rgb(230, 91, 118);
}
footer {
    background-color: #333;
    color: white;
    padding: 1.3em;
}