我想做一个视差效果但是我尝试了很多方法还是做不到。现在我有一半的视差效果，即背景图像是固定的，没有移动，下一个图像将覆盖上一个图像，但现在我希望它成为当我向下滚动时背景图像也会向下移动，但速度比原来的速度。
<!DOCTYPE html>
<html>
<style>
html, body
{
height: 100%;
width: 100%
}
html
{
overflow:hidden;
}
body
{
color: #fff;
margin: 0;
padding: 0;
perspective: 1px;
transform-style: preserve-3d;
overflow-x:hidden;
overflow-y:scroll;
}
*
{
margin:0;
padding:0;
font-family: Century Gothic;
}
.top
{
background-image:linear-gradient(rgba(0,0,0,0.8),rgba(0,0,0,0.5)), url('../image/Kinkis-Bottomless-Brunch-Lead-Image.jpg');
height: 100vh;
background-size: cover;
background-position:center;
background-attachment:fixed;
}
.bottom
{
background-image:url('../image/AdobeStock_80592193.jpeg');
height: 100vh;
background-size: cover;
background-position:center;
background-attachment:fixed;
}
.main{
max-width: 1500px;
margin: auto;
margin-left:80px;
}
.main2{
max-width: 1500px;
margin: auto;
margin-left:80px;
}
.nav
{
float:left;
list-style-type: …