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<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> <style> .out-box{ border:1px solid #ccc; width: 200px; height: 200px; } .demo{ border:1px solid #ccc; height:100px; width: calc(100% - 20px) ; } </style> </head> <body> <div class="out-box"> <div class="demo"> 慕课网:计算函数学习 </div> </div> </body> </html>
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