body {
  font-family: sans-serif;
  background-color: #fff;
}

header {
  background-color: #000;
  color: #fff;
  padding: 20px;
}

h1 {
  font-size: 2em;
}

nav {
  display: flex;
  justify-content: center;
  align-items: center;
}

a {
  text-decoration: none;
  color: #fff;
}

a:hover {
  color: #000;
}

section {
  margin-bottom: 20px;
}

.login {
  width: 300px;
  margin: 0 auto;
}

.signup {
  width: 300px;
  margin: 0 auto;
}

.content {
  width: 500px;
  margin: 0 auto;
}

input {
  width: 100%;
  height: 40px;
  border: 1px solid #ccc;
  padding: 10px;
}

input:focus {
  outline: none;
}

button {
  background-color: #000;
  color: #fff;
  width: 100px;
  height: 40px;
  border: none;
  cursor: pointer;
}

footer {
  margin-top: 20px;
  text-align: center;
}