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                            #  經驗
## 一
 在做按鈕之類的高度是寬度的兩倍，字體為黑體
##  二 定位
```
.btn{
    width: 40px;
    height: 80px;
    position: absolute;/*定位在上面的盒子里 給了定位后寬高起作用*/
    left: -40px;/*定位在盒子的外面*/
    top: 50%;
    transform: translateY(-50%);/*完全垂直居中*/
    background: rgba(0,0,0,.3);
    font-size: 40px;
    text-align: center;
    line-height: 80px;
    color: white;
    font-family: "黑體";/*做按鈕經驗之談使用黑體 */
    border-radius: 8px;
   
}
.btnRight{
    left: auto;/*left 值 恢復初始化*/
    right: -40px;
}
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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