<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <title>文書のタイトル</title> <style type="text/css"> hr { margin-bottom: 15px; } hr.example1 { height: 10px; background-color: #ffdfe2; border: 1px #ff0000 solid; color: #ffdfe2; } hr.example2 { height: 10px; background-color: #ff8080; border: 2px solid; border-color: #c40000 #ffdfe2 #ffd
![スタイルシート[CSS]/ページ全般/水平線の境界線を指定する - TAG index](https://cdn-ak-scissors.b.st-hatena.com/image/square/37a7393781ce71801a3fd24ae1552adf235c557f/height=288;version=1;width=512/https%3A%2F%2Fwww.tagindex.com%2Fimage%2Fogp%2Fstylesheet.png)