标签：background 代码 width mac 5px 10px margin
<html>
<style>
.mac {
width:10px;
height:10px;
border-radius:5px;
float:left;
margin:10px 0 0 5px;
}.b1 {
background:#E0443E;
margin-left: 10px;
}.b2 { background:#DEA123; }
.b3 { background:#1AAB29; }
.warpper{
background:#121212;
border-radius:5px;
width:400px;
}</style>
<div class="warpper">
<div class="mac b1"></div>
<div class="mac b2"></div>
<div class="mac b3"></div>
<div>
<br>
</html>
标签：background,
代码,
width,
mac,
5px,
10px,
margin
From： https://www.cnblogs.com/xy1993/p/17161407.html