可以问下为什么是这样子的顺序么?
.box1{
height: 20px;background:red;float: left;font: 18px blue;
}
.box2{
height: 20px; background:blue;float: right;font: 18px red;
}
.box3{
height: 20px;margin:0 auto;background:navy;font: 20px black;text-align: center;
}
<div class="box1">fire a fire</div>
<div class="box2">over</div>
<div class="box3">world</div>