收集几个简单的页面弹出层： 

https://codepen.io/imprakash/pen/GgNMXO?__cf_chl_jschl_tk__=3c6d5a0b97d1d991937a0b205db006c0578ef5d1-1578624953-0-AaqB4Y8VTK2n_69gU90Sb_QbS3hV5jXwUZWd3X7nH6ZY_CADinTO3V8MBEK_6FimmzcY2FQnUZPajemeubJ96OfaqFXyOEXPDB_snfxfw7vk3mOKRCWJCihuJMkmdzaI8lyvCQrvcQp2ZahUDzt4Q4gopWDlHD2GgJwPAzs6Y-RIuPFu35ocxxKcHCYWHPWpMI87pVw-0-YWAp5oeZuk2WlLPX3UY7a3f8_5o0OGheh52Bdis3k86OF4sPz9KQIP3pKsQOLH5-khJBHRdRw3FGSC4zgSH1iUcC2SrZSIlJ7XIQvK5cBV6ujR_vEb7tSR-2GOLPPcMgnApywRVhcVkD931xiLB9jJnurF2DE_Zx97

https://html-online.com/articles/simple-popup-box/ 

https://www.w3schools.com/howto/howto_css_modals.asp

https://stackoverflow.com/questions/11542822/javascript-onclick-createelement-div-viz-popup-box

https://dev.to/tayfunerbilen/popup-with-pure-css-1m4k

https://www.w3docs.com/tools/code-editor/2578

https://davesource.com/Solutions/20150324.CSS-Only-Click-to-Popup-Div/#example