Question

对于一个网站，我有以下HTML和CSS，您也可以在JSfiddle here中找到该网站：

body {
  margin: 0;
}


/* 01.00 HEADER */

.header {
  width: 80%;
  height: 10%;
  margin-left: 10%;
  display: flex;
  justify-content: space-between;
  position: fixed;
  top: 0;
  
  box-sizing: border-box;
  border-style: solid;
  border-width: 1px;
  background-color: yellow;
}

.image {
  width: 30%;
  height: 100%;
  display: flex;
  justify-content: center;
  text-align: center;
  align-items: center;
  
  box-sizing: border-box;
  border-style: solid;
  border-width: 1px;
  background-color: green;
}

.navigation {
  width: 70%;
  height: 100%;
  
  box-sizing: border-box;
  border-style: solid;
  border-width: 1px;
  background-color: aqua;
}



/* 02.00 NAVIGATION */

.navigation>ul {
  height: 100%;
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  
  box-sizing: border-box;
  border-style: solid;
  border-width: 1px;
  background-color: blue;
}

.navigation>ul>li {
  width: 100%;
  display: flex;
  justify-content: center;
  text-align: center;
  align-items: center;
  
  box-sizing: border-box;
  border-style: solid;
  border-width: 1px;
}



/* 03.00 CONTENT */

.image_animation {
 width: 80%;
 margin-left: 10%;
 margin-top: 10%;
 float: left;
 display: flex;
 justify-content: space-between;

 background-color: green;
 box-sizing: border-box;
 border-style: solid;
 border-width: 1px;
}
 
.image_list {
 width: 100%;
 position: relative;
	
 background-color: red;
 box-sizing: border-box;
 border-style: solid;
 border-width: 1px;
}
	
.image_list img {
 width: 100%;
 height: 100%;
}
 
.image1 {
 height: 100%;
 width: 100%;
 float: left;
 position: absolute;
}
 
.image2 {
 height: 100%;
 width: 100%;
 float: left;
 animation-delay: 2s;
}
 
.image_list div {
 animation-name: animation_home_images;
 animation-duration:4s;
 animation-iteration-count:infinite;
 animation-fill-mode: forwards;
 opacity:0;
 }

@keyframes animation_home_images {
  50.0% {
    opacity: 1
  }
  0%, 100%{
    opacity: 0
  }
}

<div class="header">	

      <div class="image">
      Image
      </div>
  
      <nav class="navigation"> 
      
        <ul>
          <li> 1.0 Main Menu </li>
          <li> 2.0 Main Menu </li>
          <li> 3.0 Main Menu </li>
        </ul>
        
      </nav>
      
</div>	


<div class="image_animation">
    
  <div class="image_list">
    <div class="image1"><img src="http://placehold.it/101x101"></div>
		<div class="image2"><img src="http://placehold.it/201x201"></div>
	</div>
        
</div>

如您所见，我有一个.header，其属性postion: fixed;包含一个.image和一个.navigation。在.header下方，一旦用户打开网站，我就会看到.image_animation的两幅图像在运行infinite。

到目前为止，所有这些都工作正常。

现在，我面临的问题是，一旦用户向下滚动页面，.header就会保持固定，但是动画图片仍会停留在固定的.header上方。
据我所知，此问题是由position: absolute;的{{1}}引起的。
但是，根据this问题的答案，.image1是使position: absolute;正常工作所必需的。

当用户向下滚动页面时，如何更改代码以使.image_animation都起作用，并使其位于.image_animation下面？

Answer 1

将z-index-1添加到.header类。谢谢

链接下方的参考

http://jsfiddle.net/szmbrLx2/ 888

Answer 2

尝试一下。在.header中添加z-index

body {
  margin: 0;
}


/* 01.00 HEADER */

.header {
  width: 80%;
  height: 10%;
  margin-left: 10%;
  display: flex;
  justify-content: space-between;
  position: fixed;
  top: 0;
  z-index:99;
  box-sizing: border-box;
  border-style: solid;
  border-width: 1px;
  background-color: yellow;
}

.image {
  width: 30%;
  height: 100%;
  display: flex;
  justify-content: center;
  text-align: center;
  align-items: center;
  
  box-sizing: border-box;
  border-style: solid;
  border-width: 1px;
  background-color: green;
}

.navigation {
  width: 70%;
  height: 100%;
  
  box-sizing: border-box;
  border-style: solid;
  border-width: 1px;
  background-color: aqua;
}



/* 02.00 NAVIGATION */

.navigation>ul {
  height: 100%;
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  
  box-sizing: border-box;
  border-style: solid;
  border-width: 1px;
  background-color: blue;
}

.navigation>ul>li {
  width: 100%;
  display: flex;
  justify-content: center;
  text-align: center;
  align-items: center;
  
  box-sizing: border-box;
  border-style: solid;
  border-width: 1px;
}



/* 03.00 CONTENT */

.image_animation {
 width: 80%;
 margin-left: 10%;
 margin-top: 10%;
 float: left;
 display: flex;
 justify-content: space-between;

 background-color: green;
 box-sizing: border-box;
 border-style: solid;
 border-width: 1px;
}
 
.image_list {
 width: 100%;
 position: relative;
	
 background-color: red;
 box-sizing: border-box;
 border-style: solid;
 border-width: 1px;
}
	
.image_list img {
 width: 100%;
 height: 100%;
}
 
.image1 {
 height: 100%;
 width: 100%;
 float: left;
 position: absolute;
}
 
.image2 {
 height: 100%;
 width: 100%;
 float: left;
 animation-delay: 2s;
}
 
.image_list div {
 animation-name: animation_home_images;
 animation-duration:4s;
 animation-iteration-count:infinite;
 animation-fill-mode: forwards;
 opacity:0;
 }

@keyframes animation_home_images {
  50.0% {
    opacity: 1
  }
  0%, 100%{
    opacity: 0
  }
}

<div class="header">	

      <div class="image">
      Image
      </div>
  
      <nav class="navigation"> 
      
        <ul>
          <li> 1.0 Main Menu </li>
          <li> 2.0 Main Menu </li>
          <li> 3.0 Main Menu </li>
        </ul>
        
      </nav>
      
</div>	


<div class="image_animation">
    
  <div class="image_list">
    <div class="image1"><img src="http://placehold.it/101x101"></div>
		<div class="image2"><img src="http://placehold.it/201x201"></div>
	</div>
        
</div>

如果向下滚动网站，则固定标题下的图像动画

2 个答案: