* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-size: 15px;
  line-height: 1.5;
  font-family: "Helvetica Neue", Helvetica, Arial, "PingFang SC", "Hiragino Sans GB", "Heiti SC", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  margin: 0;
  background-color: #e1e1e1;
  /*min-width: 1024px;*/
  color: #333;
}

main {
  width: 864px;
  min-height: calc(100vh - 128px);
  margin: 20px auto 0 auto;
  padding: 20px;
  background-color: white;
}

main img {
  display: block;
  margin: 12px auto;
  height: auto;
  max-width: 100%;
  border: 0;
}

header {
  position: sticky;
  z-index: 10;
  left: 0;
  top: 0;
  width: 100%;
  height: 48px;
  display: flex;
  align-items: center;
  line-height: 48px;
  padding: 0 20px;
  background-color: white;
}

footer {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  height: 60px;
}

a {
  color: #333;
}

header a {
  text-decoration: none;
  padding: 0 12px;
  font-size: 16px;
}

header a.active {
  color: #04AA6D;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  color: #1b1b1b;
}

header a.about {
  margin-left: auto;
  margin-right: 100px;
}

.brand {
  font-size: 16px;
  margin-right: 100px;
}

.go-start-of-content {
  position: fixed;
  z-index: 100;
  right: 24px;
  bottom: 20px;
  background: #f3333377;
  padding: 12px;
  border-radius: 50%;
}
.go-start-of-content:hover {
  background: #f3333399;
}

.go-start-of-content .icon {
  width: 2em;
  height: 2em;
  vertical-align: middle;
  fill: currentColor;
  overflow: hidden;
}