index.css

@charset "utf-8";
/* CSS Document */
body, html ,main{
  /* important */

  height: 100%;
}
/*-----------------------------下面是控制底面三张图的css----------------*/
.main-content {
  /* you need to assign a min-height to the main content so that the children can inherit it*/
  height: 100%;
  position: relative;
  z-index: 1;
}

.fixed-bg {
  position: relative;
  min-height: 100%;
  background-size:cover;
  background-repeat: no-repeat;
  background-position: center center;
  z-index: -900;
  background-attachment:fixed;
}
.fixed-bg.bg-1 {
  background-image:url(%E5%9B%BE%E7%89%87/cologne-central-station-railway-station-train-163580.jpeg);
}
.fixed-bg.bg-2 {
  background-image:url(%E5%9B%BE%E7%89%87/wKgB6lSwje-AXQtkABLBmrrCyrw42.jpg);
}
.fixed-bg.bg-3 {
  background-image:url(%E5%9B%BE%E7%89%87/wKgB6lSwhdmAG46XABBd-plhgAs03.jpg);
}

/*---------------下面是控制浮在上面的两个模块的css--------------------*/
.scrolling-bg {
  position: relative;
  padding: 4em 0;
  line-height: 1.6;
  box-shadow: 0 0 50px rgba(0, 0, 0, 0.5);
  z-index: -800;
  height:350px;
  
}
.scrolling-bg.color-1 {
  background-color: #3d3536;
  color: #a6989a;
}
.scrolling-bg.color-2 {
  background-color: #99a478;
  color: #3d3536;
}
.scrolling-bg.color-3 {
  background-color: #b4d7a8;
  color: #3d3536;
}

.container {
  /* this class is used to give a max-width to the element it is applied to, and center it horizontally when it reaches that max-width */

  width: 90%;
  max-width: 768px;
  margin: 0 auto;
  align-content:center;
}
.container::after {

  /* clearfix */
  content: '';
  display: table;
  clear: both;
}
@media only screen and (min-width: 768px) {
  .cd-scrolling-bg {
    padding: 8em 0;
    font-size: 20px;
    font-size: 1.25rem;
    line-height: 2;
    font-weight: 300;
  }
}
/*-------------------下面是应用于导航栏的css-----------------------------------*/
.top {
    width: 100%;
	height:12%;
    top: 0;
    left: 0;
    background-color: rgba(112,201,175,0.78);
    position: fixed;
    transition: all 0.2s ease-in;
    z-index: 999;
}
.top-text {
    width: 70%;
    min-width: 600px;
    max-width: 1200px;
    text-align: center;
    margin: 0 auto;
    overflow: hidden;
	z-index: 1000;
}
.top-text {
    text-align: center;
}
.top-text h2 {
    font-family: "Microsoft YaHei UI", "Microsoft YaHei UI Light", "微软雅黑", "黑体";
    float: left;
    text-decoration: none;
    color: #544;
    width: 14.28%;
    min-width: 80px;
    transition: all 0.2s ease-in;
}
/*----------------------下面是应用于文字的css-----------------------------*/
.fixed-bg h1, .fixed-bg h2 {
  position: absolute;
  left: 50%;
  top: 50%;
  bottom: auto;
  right: auto;
  -webkit-transform: translateX(-50%) translateY(-50%);
  -moz-transform: translateX(-50%) translateY(-50%);
  -ms-transform: translateX(-50%) translateY(-50%);
  -o-transform: translateX(-50%) translateY(-50%);
  transform: translateX(-50%) translateY(-50%);
  width: 90%;
  max-width: 1170px;
  text-align: center;
  font-size: 100px;
  font-size: 1.875rem;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
  color: white;
}
/*-------------------------补充的css-----------------------------*/
.page_container{
	height:500px;
	}