#triangle-bottomright {
0;
height: 0;
border-bottom: 100px solid red;
border-left: 100px solid transparent;
}
参考:link
参考2:https://blog.csdn.net/qq_33745371/article/details/108042057(div单选框实现(html+css+js))
#triangle-bottomright {
0;
height: 0;
border-bottom: 100px solid red;
border-left: 100px solid transparent;
}
参考:link
参考2:https://blog.csdn.net/qq_33745371/article/details/108042057(div单选框实现(html+css+js))