1. 超出部分显示...
overflow: hidden;
white-space: nowrap;
text-overflow: ellipsis;
2. 滚轮
overflow-x: hidden;
overflow-y: scroll;
::-webkit-scrollbar{
width: 24px;
}//整个滚轮
::-webkit-scrollbar-track{
background: #0C1C58;
border: 1px solid #112459;
}//轨道
::-webkit-scrollbar-thumb{
opacity: 0.7;
background: #3499DF;
}//滑轮
3. flex
justify-content: space-around;//副轴
align-items: flex-start;//主轴
4. float
.clearfix:after {
content: '';
display: block;
clear: both
}
5. 行内文字垂直居中
vertical-align: middle;
line-height: 父元素的height;
