/*topbar*/
section#topbar {
  height: 40px;
}
section#topbar nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: white;
}
section#topbar.sticky > nav {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 1;
  width: 100%;
}
section#topbar .logo {
  width: 40px;
  height: 40px;
  background: #ddd;
}
/*--------------------------------------------*/
/*site banners*/
section#siteBanners {
  z-index: 0;
  position: relative;
  max-width: 960px;
  margin: 0 auto;
  overflow: hidden;
}
section#siteBanners > ol {
}
section#siteBanners > ol > li {
  position: relative;
  border: 1px solid red;
}
section#siteBanners > ol > li > p {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
section#siteBanners > ol > li > img {
  vertical-align: top;
}
/*--------------------------------------------*/
/*section#siteIntroduce */
section#siteIntroduce {
  margin: 20px 0;
}
section#siteIntroduce > ul > li {
  display: flex;
  margin: 20px 0;
}
section#siteIntroduce > ul > li > p {
  border: 1px solid red;
  flex-grow: 1;
  padding: 1em;
}
section#siteIntroduce > ul > li img {
  vertical-align: top;
}
@media (max-width: 425px) {
  section#siteIntroduce > ul > li img {
    max-width: 200px;
  }
}
section#siteIntroduce > ul > li:nth-child(odd) > .imageWrapper {
  order: 2
}
section#siteIntroduce > ul > li:nth-child(odd) > p {
  order: 1
}
/*--------------------------------------------*/
section#siteProducts {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 100px 0;
  border: 1px solid blue;
  background: url(https://ooo.0o0.ooo/2017/05/12/5915beddc43e1.jpg) no-repeat center center;
  background-size: cover;
}
section#siteProducts h2 {
  text-align: center;
}
section#siteProducts ul {
  max-width: 504px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
}
@media (max-width: 425px) {
  section#siteProducts ul {
    margin-left: 30px;
    margin-right: 30px;
  }
}
@media (min-width: 1440px) {
  section#siteProducts ul {
    max-width: none;
  }
}
section#siteProducts ul > li {
  margin: 0 24px;
}
/*--------------------------------------------*/

section#siteAlbum {
  background: #dddddd;
  padding: 20px 0;
}
section#siteAlbum h2 {
  text-align: center;
  margin: 20px 0;
}
section#siteAlbum > .inner {
  max-width: 960px;
  margin: 0 auto;
}
/*--------------------------------------------*/
footer {
  background: #666;
  text-align: center;
  padding: 10px 0;
}
#goTop {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: hsla(0, 0%, 0%, 0.5);
  color: white;
  border: none;
  padding: 1em;
  z-index: 1;
}
#canvasWrapper {
  position: relative;
  height: 100vh;
}
#canvasWrapper .controls {
  position: absolute;
  bottom: 0; right: 0;
  z-index:1;
}