body {
  font-family: sans-serif;
}

header {
  background-color: #f0f0f0;
  padding: 20px;
}

main {
  margin: 0 auto;
  width: 500px;
}

form {
  margin-top: 20px;
}

.form-group {
  margin-bottom: 10px;
}

.form-control {
  width: 100%;
  border: 1px solid #ccc;
  padding: 10px;
}

.btn {
  background-color: #000;
  color: #fff;
  font-weight: bold;
  padding: 10px 20px;
  border-radius: 5px;
}

.btn-primary {
  background-color: #000;
  color: #fff;
  font-weight: bold;
  padding: 10px 20px;
  border-radius: 5px;
}

ul {
  list-style-type: none;
  padding: 0;
  margin: 0;
}

li {
  margin-bottom: 10px;
}