/* -------------------------------- 

Primary style

-------------------------------- */

body {
	font-size: 100%;
	font-family: "Bitter", sans-serif;
	color: #333333;
	background-color: #fff;
}

/* -------------------------------- 

Modules - reusable parts of our design

-------------------------------- */
.cd-container {
  width: 90%;
  max-width: 768px;
  height:3000px;
  margin: 2em auto;
  display:block
}
.cd-container::after {
  /* clearfix */
  content: '';
  display: table;
  clear: both;
}

/* -------------------------------- 

Main components 

-------------------------------- */
header {
  background: #5c4751;
  height: 100px;
  text-align: center;
}
header h1 {
  font-size: 20px;
  font-size: 1.25rem;
  font-weight: bold;
  font-family: "Open Sans", sans-serif;
  text-transform: uppercase;
  font-weight: bold;
  padding-top: 1.6em;
  margin-bottom: .2em;
}
header p {
  font-size: 13px;
  font-size: 0.8125rem;
  color: #957484;
}
@media only screen and (min-width: 1024px) {
  header {
    height: 200px;
  }
  header h1 {
    font-size: 30px;
    font-size: 1.875rem;
    padding-top: 2.6em;
  }
}

main p {
  font-size: 14px;
  font-size: 1rem;
  line-height: 22px;
}
@media only screen and (min-width: 1024px) {
  main p {
    font-size: 14px;
    font-size: 1rem;
  }
}

.cd-top {
	display: inline-block;
	height: 40px;
	width: 40px;
	position: fixed;
	bottom: 40px;
	right: 10px;
	box-shadow: 0 0 10px rgba(0, 0, 0, 0.05);
	/* image replacement properties */
	overflow: hidden;
	text-indent: 100%;
	white-space: nowrap;
	visibility: hidden;
	opacity: 0;
	-webkit-transition: all 0.3s;
	-moz-transition: all 0.3s;
	transition: all 0.3s;
	background-color: rgba(36,131,236,0.8);
	background-image: url(/images/arr.png);
	background-repeat: no-repeat;
	background-position: center 50%;
}
.cd-top.cd-is-visible {
  /* the button becomes visible */
  visibility: visible;
  opacity: 1;
}
.cd-top.cd-fade-out {
  /* 如果用户继续向下滚动,这个按钮的透明度会变得更低 */
  opacity: .5;
}
.no-touch .cd-top:hover {
  background-color: #e86256;
  opacity: 1;
}
@media only screen and (min-width: 768px) {
  .cd-top {
    right: 20px;
    bottom: 20px;
  }
}
@media only screen and (min-width: 1024px) {
  .cd-top {
    height: 60px;
    width: 60px;
    right: 30px;
    bottom: 30px;
  }
}