📅  最后修改于: 2022-03-11 15:02:08.885000             🧑  作者: Mango
= Super Fast Trains
= Mail/Express Trains
= Local/ Passenger Trains
// CSS
.box {
float: left;
height: 20px;
width: 20px;
margin-bottom: 15px;
border: 1px solid black;
clear: both;
}
.red {
background-color: red;
}
.green {
background-color: green;
}
.blue {
background-color: blue;
}