接下来把背景放大500%，然后设置了一个15秒的动画，动画infinite无限循环。
动画部分就是对背景进行一个定位，实现渐变颜色的动态切换。
html结构
css样式
gitee地址： siebe/html-css-demo (https://gitee.com/siebe/html-css-demo)
1.渐变动画背景body {
background: linear-gradient(-45deg, #ee7752, #e73c7e, #23a6d5, #23d5ab)
background-size: 400% 400%
animation: gradient 15s ease infinite
height: 100vh
}
@keyframes gradient {
0% {
background-position: 0% 50%
}
50% {
background-position: 100% 50%
}
100% {
background-position: 0% 50%
}
}
2.浮动动画效果
div {
box-shadow: 0 5px 15px 0px rgba(0,0,0,0.6)
transform: translatey(0px)
animation: float 6s ease-in-out infinite
}
@keyframes float {
0% {
box-shadow: 0 5px 15px 0px rgba(0,0,0,0.6)
transform: translatey(0px)
}
50% {
box-shadow: 0 25px 15px 0px rgba(0,0,0,0.2)
transform: translatey(-20px)
}
100% {
box-shadow: 0 5px 15px 0px rgba(0,0,0,0.6)
transform: translatey(0px)
}
}
<div class="change"></div>
<style>
.change {
animation: change 9s steps(1) infinite
background-repeat: no-repeat
background-position: center center
background-size: 100% auto
width: 200px
height: 100px
}
@keyframes change {
0% {
background-image: url(https://www.baidu.com/img/PCtm_d9c8750bed0b3c7d089fa7d55720d6cf.png)
}
33% {
background-image: url(https://www.duhongwei.site/img/201809/s1.png)
}
66% {
background-image: url(https://p4.ssl.qhimg.com/t01fcaa9d8a4d24b5f1.png)
}
}
</style>
纯 css 每3秒播一张图片。9s是总共时间，如果是4张图片这里写 12s
