html {
  scroll-behavior: smooth;
}

/* 去除常见标签默认的 margin 和 padding */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

a {
  text-decoration: none;
  color: #333;
}

/* 设置网页统一的字体大小、行高、字体系列相关属性 */
body {
  font: 16px/1 "Microsoft Yahei",
    "Hiragino Sans GB", "Heiti SC", "WenQuanYi Micro Hei", sans-serif;
  color: #333;
}

.w {
  max-width: 1240px;
  margin: 0 auto;
}

.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 80px;
  background-color: pink;
}

.content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 8%;
}

.logo { 
  width: 260px;
  height: 80px;
  line-height: 80px;
}

.logo img {
  width: 100%;
  height: 100%;
}

.title {
  padding-right: 40px;
  font-size: 18px;
  color: #333;
}

main {
  margin-top: 80px;
  margin-bottom: 60px;
}

video {
  width: 100%;
  height: 100%;
}

main img {
  display: block; 
  width: 100%; 
  height: auto;   
  margin: 10px auto;
}

.article {
  padding: 40px;
  background-color: #f5f5f5;
}

.article p {
  font-size: 16px;
  line-height: 32px;
  text-align: justify;
}

.text-primary {
  color: #f00;
}

.footer {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 60px;
  background-color: #f5f5f5;
}