抱歉，这可能是一个“菜鸟”问题，但它就在这里......我正在将标题修改为我的 tumblr 主题的侧边栏。我创建了一个新类，但意识到我可以创建一个 id，因为我只会将它用于那个实例。我创建了一个新 ID：
#bigborder {font-size: 13px; height: 25px; padding: 2px; letter-spacing: 2px; text-transform: uppercase; color: #999; background-color: #222;}
我把它放在旧 div 类标签的位置：
<div id="left"><div class="border"><center><a href="/">Page Title</a></center></div>
至
<div id="left"><div id="bigborder"><center><a href="/">Untitled</a></center></div>
并且单词恢复为正文的默认值。
以下是页面中的整个 CSS 以供参考：
<style type="text/css">
iframe#ask_form {height: 150px!important;}
img, img a {border: none;}
body {font-family: offside; font-size: 7pt !important; color: #e4e4e4; background-color: #222; background-image:url(''); background-attachment: relative; margin-top:15px;}
a {color: #fff; text-decoration: none !important; -webkit-transition-duration: .3s; text-transform: uppercase; letter-spacing: 2px;}
#center {width:500px; background-color: transparent; padding:10px; margin: auto; font-size: 10px; margin-bottom: 20px;}
#right {top: 30px; left:50%; margin-left:268px; position:fixed; width: 150px; text-transform: lowercase; padding: 5px; background-color: ; -webkit-border-radius:5px;-moz-border-radius:5px 5px 5px 5px; }
#left {top: 30px; right:50%; margin-right:268px; position:fixed; width: 150px; text-transform: lowercase; padding: 5px; background-color: ; -webkit-border-radius:5px;-moz-border-radius:5px 5px 5px 5px;}
.desc {padding: 9px; margin-bottom: 7px; font-size: 10px; width: auto;}
.drop {margin-top: 5px; font-size: 10px;}
#qtm {margin: 5px; display: inline-block; font-size: 40px; float: left;}
#qt {margin: 5px; display: inline-block; font-size: 18px; width: 400px;}
#src {font-size: 10px;}
.entry {padding: 5px; background-color: #333; margin-top: 0px; margin-bottom: 20px; -webkit-transition-duration: .1s; -webkit-border-radius:5px;-moz-border-radius:5px 5px 5px 5px; overflow: hidden;}
.entry:hover #perma {display: block;}
.entry a {-webkit-transition-duration: .3s; color: #999;}
.entry a:hover {color: #fff; texxt-transform: uppercase !important;}
blockquote {border-left-width: 1px; border-left-style: dashed; border-opacity:.5; border-left-color: #666; padding:0px; padding-left: 5px; margin: 5px;}
.search {width: 140px; background-color: #dcdcdc; font-size: 10px; border: none; text-align: center; padding: 5px;}
.header {color: #fff; padding-bottom: 5px; border-bottom: 1px solid #444; margin-bottom: 5px; font-size: 25px; font-family: offside; -webkit-transition-duration: .3s; letter-spacing: 0px; text-transform: uppercase; text-align: center; }
h2 {color: #fff; margin-bottom: 5px; font-size:20px;font-family: offside; -webkit-transition-duration: .3s; letter-spacing: 0px; text-transform: none; }
.title {
font-family: offside;
font-size: 40px;
font-style: normal;
text-transform:none;
letter-spacing: 0px;
-webkit-transition-duration: .3s;
}
#perma {display: none; margin-top: 5px;}
.perma {text-align: center; background-color:; padding: 1px; font-size: 10px;}
.perma_info {margin-left: 5px; margin-right: 5px;}
.caption {margin-top: 5px; padding: 2px; background-color: font-size: 9pt; color: #e4e4e4;}
.nav1 {font-size: 20px; margin-top: 5px; padding: 5px;}
.nav2 {font-size: 20px; text-align: right; padding: 5px; margin-top: -34px;}
.ask {padding: 5px; z-index: 1000000000; font-size: 30px; font-family: offside;}
.q {background-color: #444; color: #fff; font-size: 12px;}
.tri {font-size: 12px; margin-top: -5px; margin-bottom: 3px; color: ; z-index: -1000; margin-left: 15px;}
.audio {width: 490px; text-align: center; background-color: #e4e4e4;}
.label {font-weight: bold; margin-right: 15px;}
blockquote p, ul{ margin:0px; padding:0px; }
ul, ol, li{list-style:none; margin:0px; padding:0px;}
.pages {margin: 5px 0 5px 0; text-align: center; line-height: 20px;}
.pages a {padding: 2px 4px 2px 4px; background-color: #444; -webkit-transition-duration: .3s; color: #fff;}
.pages a:hover {background-color: #222; color: #fff;}
.touch {text-transform: uppercase; margin-bottom: 5px; padding: 3px; background-color: #0e49ab; text-align: right; -webkit-transition-duration: .3s; color: #fff; font-size: 8px; letter-spacing: 2px;}
.touch:hover {background-color: #222; color: #fff;}
.navi {margin-bottom: 5px; padding: 3px; background-color: #ffffff; -webkit-transition-duration: .3s; color: #777777;}
.navi:hover {background-color: {color:Link Background Hover}; color: {color:Link Font Hover};}
.border {font-size: 13px; height: 15px; padding: 2px; letter-spacing: 2px; text-transform: uppercase; color: #999; background-color: #222; margin-bottom: 13px; border: #333 1px solid; -webkit-border-top-left-radius:5px;-webkit-border-top-right-radius:5px;-moz-border-radius:5px 5px 0px 0px;}
.border a {color: #999; -webkit-transition-duration: .3s; width: 500px; }
.border a:hover (color: #fff;)
#bigborder {font-size: 13px; height: 25px; padding: 2px; letter-spacing: 2px; text-transform: uppercase; color: #999; background-color: #222;}
</style>
所以我的问题是，我将如何更改边框大小，因为它不适用于我创建的 div id。引用的任何错误？