如何获得这些ID标签以正确设置样式？

Question

我有一个包含多个页面，关于页面，联系页面等的网站模板。

每页顶部的图片容器都分配了一个ID标签#subheader。因此，它分布在所有页面中。我想更改每页的照片，因此我复制并粘贴了#id标签的css，并为每张标签稍作更改。我希望只更改每个网址，并更改标签名称，以便我可以相应地更改html。

问题在于，后续的ID标记始终会破坏图像。它将整个结构排除在外。但是，当我将URL分配给原始类时，照片效果很好。

我在这里想念什么？

  #subheader {
  padding-bottom: 70px;
  background: #222;
  background: url(file:///Users/Nineborn/Desktop/New%20LW%20Construction%20Site/Services.jpg)top fixed;
  background-size: cover;
    background-repeat: no-repeat;

    }

    #subheader2 {
  padding-bottom: 70px;
  background: #222;
  background: url(file:///Users/Nineborn/Desktop/New%20LW%20Construction%20Site/Architect.jpg)top fixed;
  background-size: cover;
    background-repeat: no-repeat;
}

#subheader3 {
  padding-bottom: 70px;
  background: #222;
  background: url(file:///Users/Nineborn/Desktop/New%20LW%20Construction%20Site/Architect.jpg)top fixed;
  background-size: cover;
    background-repeat: no-repeat;
}

#subheader2： 原始#subheader：

这是#subheader标记的完整CSS。

    /* subheader */
#subheader {
  padding-bottom: 70px;
  background: #222;
  background: url(file:///Users/Nineborn/Desktop/New%20LW%20Construction%20Site/Services.jpg)top fixed;
  background-size: cover;
    background-repeat: no-repeat;

}

#subheader h1 {
  color: #eceff3;
  text-align: center;
  margin-top: 40px;
  font-size: 32px;
  font-weight: 00;
  letter-spacing: 1px;
  text-transform: uppercase;
  text-shadow: 2px 2px 2px black;
}
#subheader span {
  letter-spacing: 2px;
  display: inline-block;
  font-size: 15px;
  margin-top: 88px;
  color: #fff;
}
#subheader .subdetail {
  font-size: 11px;
  letter-spacing: 2px;
  text-align: center;
  margin-top: 10px;
  text-transform: uppercase;
  color: #777;
  padding-left:0px !important;
}
#subheader .subdetail li {
  display: inline-block;
  color: #fff;
  margin:0;
  text-shadow: 2px 2px 6px black;
  font-weight: 700;
}
#subheader .subdetail li a {
  color: #ff6600;
}
#subheader .subdetail li.sep {
  margin-right: 20px;
}
/* subheader end */

Answer 1

此：

#subheader {
  padding-bottom: 70px;
  background: #222;
  background: url(file:///Users/Nineborn/Desktop/New%20LW%20Construction%20Site/Services.jpg)top fixed;
  background-size: cover;
  background-repeat: no-repeat;
}

#subheader2 {
  padding-bottom: 70px;
  background: #222;
  background: url(file:///Users/Nineborn/Desktop/New%20LW%20Construction%20Site/Architect.jpg)top fixed;
  background-size: cover;
  background-repeat: no-repeat;
}

#subheader3 {
  padding-bottom: 70px;
  background: #222;
  background: url(file:///Users/Nineborn/Desktop/New%20LW%20Construction%20Site/Architect.jpg)top fixed;
  background-size: cover;
  background-repeat: no-repeat;
}

可以简化为：

.subheader {
  padding-bottom: 70px;
  background-color: #222;
  background-position: top left;
  background-attachment: fixed;
  background-size: cover;
  background-repeat: no-repeat;
}

.subheader.services {
  background-image: url(file:///Users/Nineborn/Desktop/New%20LW%20Construction%20Site/Services.jpg);
}

/* H1s specific to services */
.subheader.services h1 {
  …
}

.subheader.architect {
  background-image: url(file:///Users/Nineborn/Desktop/New%20LW%20Construction%20Site/Architect.jpg);
}

/* H1s specific to architect */
.subheader.architect h1 {
  …
}

HTML

<div class="subheader services">
  <h1>…</h1>
</div>
<div class="subheader architect">
  <h1>…</h1>
</div>