CSS 基础样式示例：简洁、美观、易于使用

body {
  font-family: 'Arial', sans-serif;
  color: #333;
  background-color: #f5f5f5;
}

a {
  color: #007bff;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

h1 {
  font-size: 2rem;
  font-weight: bold;
  margin: 1rem 0;
}

p {
  font-size: 1rem;
  line-height: 1.5;
  margin: 0 0 1rem;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

.btn {
  display: inline-block;
  padding: 0.5rem 1rem;
  font-size: 1rem;
  font-weight: bold;
  line-height: 1.5;
  color: #fff;
  background-color: #007bff;
  border: none;
  border-radius: 0.25rem;
  cursor: pointer;
}

.btn:hover {
  background-color: #0069d9;
}

.btn-secondary {
  background-color: #6c757d;
}

.btn-secondary:hover {
  background-color: #5a6268;
}