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我知道可以使用邊框代替水平線標記（hr）。但是，在這種情況下，我不希望線路佔用100％寬度;當前div不和所以想如果我是把邊框的邊框。水平線佔據小於100％的寬度
所以我想提出一個水平線（hr）與80％的寬度，但它沒有顯示出來，還有專門的寬度不是80％。我想插入它的地方是代碼中bottom類之後的第一行。
我的意圖是將水平線（hr）放在頁面上的可樂（<p class="center1">Cola</p>）的正上方。此外，造型在hr類中似乎不起作用;試圖把它的寬度和顏色。
* {
margin: 0;
}
body {
background-color: green;
}
html,
body {
height: 100%;
}
#subnav {
height: 10%;
text-align: center;
}
#subnav ul {
list-style-type: none;
margin: 0;
padding: 0;
overflow: hidden;
background-color: red;
text-align: center;
width: 100%;
font-weight: bold;
}
#subnav li {
display: inline-block;
}
#subnav li a {
display: block;
color: white;
text-align: center;
padding: 14px 16px;
text-decoration: none;
}
#subnav li a:hover {
color: yellow;
}
#subnav li a:active {
color: yellow;
}
#bigwrap {
height: 100%;
}
.container {
display: flex;
position: relative;
flex-flow: row wrap;
justify-content: center;
align-items: stretch;
min-height: 100vh;
width: 80%;
margin: 0 auto;
background-color: white;
font-size: 20px;
}
.top {
display: flex;
flex-flow: row wrap;
justify-content: flex-start;
align-items: center;
}
.bottom {
display: flex;
flex-flow: row wrap;
justify-content: space-around;
align-items: flex-start;
}
.bottom {
flex: 0 0 100%;
height: 50%;
}
hr.style1 {
border-top: 1px solid #8c8b8b;
width: 80%;
}
.top {
flex: 0 0 100%;
height: 50%;
}
.topa {
display: flex;
flex-flow: column wrap;
justify-content: center;
align-items: flex-start;
margin-left: 3%;
width: 45%;
height: 100%;
}
.topb {
display: flex;
flex-flow: row wrap;
justify-content: center;
align-content: center;
width: 50%;
height: 100%;
}
li {
list-style-type: none;
font-size: 18px;
}
.advisory {
background-color: white;
margin: auto;
width: 100%;
}
#advisory ul li {
margin-bottom: 2%;
}
.center {
text-align: center;
}
.center1 {
text-align: center;
color: green;
font-size: 28px;
}
.tpoint {
font-size: 24px;
color: orange;
}<div class="container">
<div id="subnav">
<ul>
<li> <a href="#">Sam </a>
</li>
<li> <a href="#">Sam </a>
</li>
<li> <a class="active" href="#">Corn </a>
</li>
<li> <a href="#">Sam </a>
</li>
<li> <a href="#">Sam </a>
</li>
<li> <a href="#">Sam </a>
</li>
<li> <a href="#">Sam </a>
</li>
</ul>
</div>
<div class="top">
<div class="topa">
<img src="ham.jpg" width="209" height="205" alt="Picture of kid" />
<img src="bacon.jpg" width="209" height="205" alt="Picture of kid\" />
</div>
<div class="topb">
<h2> Sams </h2>
<p>Sample sentence this Sample sentence this Sample sentence this Sample sentence this Sample sentence this Sample sentence this Sample sentence this Sample sentence this Sample sentence this Sample sentence this Sample sentence this Sample sentence
this Sample sentence this Sample sentence this Sample sentence this Sample sentence this Sample sentence this Sample sentence this Sample sentence this Sample sentence this Sample sentence this Sample sentence this Sample sentence this Sample
sentence this Sample sentence this Sample sentence this Sample sentence this</p>
</div>
</div>
<div class="bottom">
<div class="sam">
<hr class="style1">
<p class="center1">Cola</p>
<p class="center tpoint">Sample</p>
<ul>
<li>Sample
<ul>
<li>Sample</li>
<li>rsam</li>
</ul>
</li>
<li>san
<ul>
<li>sam</li>
<li>sam</li>
</ul>
</li>
<li>sam
<ul>
<li>sam</li>
<li>sam</li>
</ul>
</li>
<li>sam
<ul>
<li>sam</li>
<li>sam</li>
</ul>
</li>
<li>sam
<ul>
<li>sam</li>
<li>sam</li>
</ul>
</li>
</ul>
<p class="center tpoint">The sam</p>
<ul>
<li>sam
<ul>
<li>sam</li>
</ul>
</li>
<li>sam</li>
<li>sam</li>
<li>sam</li>
<li>sam</li>
<li>sam</li>
<li>sam</li>
<li>sam</li>
</ul>
<p class="center tpoint">Eggs</p>
<ul>
<li>sam
<ul>
<li>san</li>
</ul>
</li>
<li>Eri
<ul>
<li>Sam</li>
</ul>
</li>
</ul>
</div>
</div>
</div>
你的線路的父母是div'sam'，它的寬度爲134px。通過將「hr」寬度設置爲80％，您可以告訴它是134px的80％。 – Santi