使用媒体查询更改变量
媒体类型允许你指定文件将如何在不同媒体呈现。该文件可以以不同的方式显示在屏幕上，在纸张上，或听觉浏览器等等。
CSS 变量可以简化媒体查询的方式。 例如，当屏幕小于或大于媒体查询所设置的值，通过改变变量的值，那么应用了变量的元素样式都会得到响应修改。
在media query（媒体查询）声明的:root选择器里，重定义–rabbit-basecolor的值为 white，且重定义–rabbit-background的值为 rgb(198, 250, 241)，然后通过缩放页面来查看是否生效。
核心代码
:root {
--rabbit-ear-shadow: pink;
--rabbit-basecolor: gray;
--rabbit-skincolor:whitesmoke;
--rabbit-background:#E2B29F;
}
@media (max-width: 350px) {
表示，在小于350px的时候，下列代码均生效。
:root {
/* 在这行下面修改代码 */
--rabbit-basecolor: white;
--rabbit-background:rgb(198, 250, 241);
/* 在这行上面修改代码 */
}
}
完整代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Easter Rabbit</title>
<style>
html {
width: 100%;
height: 100%;
}
:root {
--rabbit-ear-shadow: pink;
--rabbit-basecolor: gray;
--rabbit-skincolor:whitesmoke;
--rabbit-background:#E2B29F;
}
@media (max-width: 350px) {
:root {
/* 在这行下面修改代码 */
--rabbit-basecolor: white;
--rabbit-background:rgb(198, 250, 241);
/* 在这行上面修改代码 */
}
}
body {
width: 100%;
height: 100%;
background: var(--rabbit-background);
display: flex;
justify-content: center;
align-items: center;
}
.rabbit {
position: relative;
}
.rabbit .rabbit__body {
width: 4em;
height: 5.6em;
background: var(--rabbit-skincolor, whitesmoke);
border-radius: 50% 50% 50% 50%/60% 60% 40% 40%;
-webkit-transform: rotate(-40deg);
transform: rotate(-40deg);
box-shadow: inset -2.3em -2.7em 0 0 var(--rabbit-basecolor);
}
.rabbit .rabbit__head {
position: absolute;
width: 4em;
height: 4.6em;
top: -2.5em;
left: -2em;
background: var(--rabbit-basecolor);
border-radius: 50% 50% 50% 50%/65% 60% 40% 35%;
-webkit-transform: rotate(-120deg);
transform: rotate(-120deg);
overflow: hidden;
}
.rabbit .rabbit__head:before {
content: "";
position: absolute;
width: 0.65em;
height: 0.5em;
top: -0.1em;
left: 1.8em;
background: #F97996;
border-radius: 50% 50% 50% 50%/30% 30% 70% 70%;
-webkit-transform: rotate(130deg);
transform: rotate(130deg);
}
.rabbit .rabbit__head:after {
content: "";
position: absolute;
width: 1em;
height: 1em;
top: 1.5em;
left: 1.6em;
background: #F4F4F4;
border-radius: 50%;
box-shadow: inset 0.1em 0.15em 0 0.37em #3D261C;
}
.rabbit .rabbit__ear {
position: absolute;
border-radius: 50% 50% 50% 50%/40% 40% 60% 60%;
-webkit-transform-origin: 50% 100%;
transform-origin: 50% 100%;
}
.rabbit .rabbit__ear--left {
width: 2.2em;
height: 4.7em;
top: -5.7em;
left: -0.2em;
background: var(--rabbit-ear-shadow, #FFF);
-webkit-transform: rotate(40deg);
transform: rotate(40deg);
box-shadow: inset 0.3em -0.4em 0 -0.1em var(--rabbit-basecolor);
-webkit-animation: ear-left 5s infinite ease-out;
animation: ear-left 5s infinite ease-out;
}
.rabbit .rabbit__ear--right {
width: 2em;
height: 4.7em;
top: -5.5em;
left: -0.7em;
background: var(--rabbit-basecolor);
-webkit-transform: rotate(10deg);
transform: rotate(10deg);
-webkit-animation: ear-right 5s infinite ease-out;
animation: ear-right 5s infinite ease-out;
}
.rabbit .rabbit__leg {
position: absolute;
}
.rabbit .rabbit__leg--one {
width: 0.8em;
height: 3em;
top: 2.3em;
left: 0.2em;
background: var(--rabbit-basecolor);
border-radius: 50% 50% 50% 50%/30% 30% 70% 70%;
-webkit-transform-origin: 50% 0%;
transform-origin: 50% 0%;
-webkit-transform: rotate(15deg);
transform: rotate(15deg);
}
.rabbit .rabbit__leg--one:before {
content: "";
position: absolute;
width: 0.8em;
height: 0.5em;
top: 2.6em;
left: -0.2em;
background: var(--rabbit-basecolor);
border-radius: 50% 50% 50% 50%/70% 70% 30% 30%;
-webkit-transform: rotate(-10deg);
transform: rotate(-10deg);
}
.rabbit .rabbit__leg--three {
width: 0.9em;
height: 3em;
top: 2.4em;
left: 0.7em;
background: var(--rabbit-basecolor);
border-radius: 50% 50% 50% 50%/30% 30% 70% 70%;
-webkit-transform-origin: 50% 0%;
transform-origin: 50% 0%;
-webkit-transform: rotate(10deg);
transform: rotate(10deg);
}
.rabbit .rabbit__leg--three:before {
content: "";
position: absolute;
width: 0.8em;
height: 0.5em;
top: 2.6em;
left: -0.2em;
background: var(--rabbit-basecolor);
border-radius: 50% 50% 50% 50%/70% 70% 30% 30%;
-webkit-transform: rotate(-10deg);
transform: rotate(-10deg);
}
.rabbit .rabbit__leg--two {
width: 2.6em;
height: 3.6em;
top: 1.7em;
left: 1.6em;
background: var(--rabbit-basecolor);
border-radius: 50% 50% 50% 50%/50% 50% 50% 50%;
-webkit-transform-origin: 50% 0%;
transform-origin: 50% 0%;
-webkit-transform: rotate(10deg);
transform: rotate(10deg);
}
.rabbit .rabbit__leg--two:before {
content: "";
position: absolute;
width: 1.6em;
height: 0.8em;
top: 3.05em;
left: 0em;
background: var(--rabbit-basecolor);
border-radius: 50% 50% 50% 50%/70% 70% 30% 30%;
-webkit-transform: rotate(-10deg);
transform: rotate(-10deg);
}
.rabbit .rabbit__leg--four {
width: 2.6em;
height: 3.6em;
top: 1.8em;
left: 2.1em;
background: var(--rabbit-basecolor);
border-radius: 50% 50% 50% 50%/50% 50% 50% 50%;
-webkit-transform-origin: 50% 0%;
transform-origin: 50% 0%;
-webkit-transform: rotate(10deg);
transform: rotate(10deg);
}
.rabbit .rabbit__leg--four:before {
content: "";
position: absolute;
width: 1.6em;
height: 0.8em;
top: 3.05em;
left: 0em;
background: var(--rabbit-basecolor);
border-radius: 50% 50% 50% 50%/70% 70% 30% 30%;
-webkit-transform: rotate(-10deg);
transform: rotate(-10deg);
}
.rabbit .rabbit__tail {
position: absolute;
width: 0.9em;
height: 0.9em;
top: 3.7em;
left: 4em;
background: var(--rabbit-basecolor);
-webkit-transform: rotate(25deg);
transform: rotate(25deg);
}
.rabbit .rabbit__tail:after, .rabbit .rabbit__tail:before {
content: "";
position: absolute;
width: 100%;
height: 100%;
background: var(--rabbit-basecolor);
border-radius: 50%;
}
.rabbit .rabbit__tail:before {
top: 0;
left: -50%;
}
.rabbit .rabbit__tail:after {
top: 50%;
left: 0;
}
@-webkit-keyframes ear-left {
0%, 20%, 100% {
-webkit-transform: rotate(40deg);
transform: rotate(40deg);
}
10%, 30%, 80% {
-webkit-transform: rotate(45deg);
transform: rotate(45deg);
}
90% {
-webkit-transform: rotate(50deg);
transform: rotate(50deg);
}
}
@keyframes ear-left {
0%, 20%, 100% {
-webkit-transform: rotate(40deg);
transform: rotate(40deg);
}
10%, 30%, 80% {
-webkit-transform: rotate(45deg);
transform: rotate(45deg);
}
90% {
-webkit-transform: rotate(50deg);
transform: rotate(50deg);
}
}
@-webkit-keyframes ear-right {
0%, 20%, 100% {
-webkit-transform: rotate(10deg);
transform: rotate(10deg);
}
10%, 30%, 80% {
-webkit-transform: rotate(5deg);
transform: rotate(5deg);
}
90% {
-webkit-transform: rotate(0deg);
transform: rotate(0deg);
}
}
@keyframes ear-right {
0%, 20%, 100% {
-webkit-transform: rotate(10deg);
transform: rotate(10deg);
}
10%, 30%, 80% {
-webkit-transform: rotate(5deg);
transform: rotate(5deg);
}
90% {
-webkit-transform: rotate(0deg);
transform: rotate(0deg);
}
}
</style>
</head>
<body>
<!-- partial:index.partial.html -->
<div class="rabbit">
<div class="rabbit__leg rabbit__leg--one">
</div>
<div class="rabbit__leg rabbit__leg--two">
</div>
<div class="rabbit__tail">
</div>
<div class="rabbit__body">
</div>
<div class="rabbit__leg rabbit__leg--three">
</div>
<div class="rabbit__leg rabbit__leg--four">
</div>
<div class="rabbit__ear rabbit__ear--right">
</div>
<div class="rabbit__head">
</div>
<div class="rabbit__ear rabbit__ear--left">
</div>
</div>
<!-- partial -->
</body>
</html>