小程序的宿主环境：1、通信模型 2、运行机制 3、组件 4、API
<!--pages/list/list.wxml-->
<view class="container1">
<view>A</view>
<view>B</view>
<view>C</view>
</view>

list.wxss
.container1 view{
width: 100px;
height: 100px;
text-align: center;
line-height: 100px;
}

.container1 view:nth-child(1){
background-color: lightgreen;
}
.container1 view:nth-child(2){
background-color: lightskyblue;
}
.container1 view:nth-child(3){
background-color:lightpink;
}
.container1{
display: flex;
justify-content: space-around;
}