body {
  font-family: Arial, sans-serif;
  max-width: 600px;
  margin: 40px auto;
}

h1 {
  text-align: center;
}
button {
  padding: 10px 20px;
  font-size: 16px;
}
input {
  padding: 10px;
  font-size: 16px;
  width: 100%;
  box-sizing: border-box;
}
label {
  font-weight: bold;
  display: block;
  margin-bottom: 8px;
}
form {
  display: flex;
  flex-direction: column;
  gap: 15px;
}
.container {
  padding: 20px;
  border: 1px solid #cccccc;
  border-radius: 10px;
}
 
nav a {
  display: inline-block;
  padding: 10px 20px;
  font-size: 16px;
  border: 1px solid #666666;
  border-radius: 8px;
  text-decoration: none;
}
.container nav a {
  display: block;
  width: 100%;
  box-sizing: border-box;
  text-align: center;
}