body {
  height: 2000px;
  background-color: #D4F8FE;
}

#header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  padding-left: 20px;
  background-color: #FFA478;
}
#header > a {
  color: #fff;
  font-size: 26px;
  line-height: 26px;
  font-weight: bold;
  padding: 10px;
  display: inline-block;
}
#header > a:hover {
  color: #FF4747;
}

.sth {
  margin-top: 70px;
  padding-left: 30%;
}

.toolbar {
  position: fixed;
  left: 50%;
  bottom: 10%;
  margin-left: -25.5px;
}
.toolbar .toolbar-item {
  position: relative;
  display: block;
  width: 51px;
  height: 51px;
  margin-top: 1px;
  background: url("../images/spirit.png") no-repeat;
  -webkit-transition: all 0.25s ease;
  transition: all 0.25s ease;
}
.toolbar .toolbar-weixin {
  background-position: 0 -372px;
}
.toolbar .toolbar-weixin:hover {
  background-position: 0 -434px;
}
.toolbar .toolbar-feedback {
  background-position: 0 0;
}
.toolbar .toolbar-feedback:hover {
  background-position: 0 -62px;
}
.toolbar .toolbar-app {
  background-position: 0 -124px;
}
.toolbar .toolbar-app:hover {
  background-position: 0 -186px;
}
.toolbar .toolbar-top {
  background-position: 0 -248px;
}
.toolbar .toolbar-top:hover {
  background-position: 0 -310px;
}