摘要：
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> </head> <style type="text/css"> #d01{ width: 200px; height: 150px; background-color: green; } </style> <body style="height: 2000px; 阅读全文
摘要：
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> </head> <style type="text/css"> #d01{ width: 100px; height: 100px; background-color: red; position: absolute; } #d02{ width: 100px; 阅读全文