问题描述
我是新手,刚刚学习编码。我被困在一件很简单的事情上,我猜。如何使页面中的下拉按钮居中?这是 HTML 代码。
.dropbtn {
background-color: #04AA6D;
color: white;
padding: 16px;
font-size: 16px;
border: none;
min-width: 110px;
font-weight: bold;
vertical-align: middle;
}
.dropdown {
position: relative;
display: inline-block;
}
.dropdown-content {
display: none;
position: center;
background-color: #f1f1f1;
min-width: 110px;
Box-shadow: 0px 8px 16px 0px rgba(0,0.2);
z-index: 1;
text-align: center;
}
.dropdown-content a {
color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
}
.dropdown-content a:hover {background-color: #ddd;}
.dropdown:hover .dropdown-content {display: block;}
.dropdown:hover .dropbtn {background-color: #3e8e41;}
<div class="dropdown">
<button class="dropbtn">Dropdown</button>
<div class="dropdown-content">
<a href="#">Link 1</a>
<a href="#">Link 2</a>
<a href="#">Link 3</a>
</div>
</div>
我没有为这个下拉按钮使用任何 CSS 或 JavaScript。
我是否也应该使用 CSS 和 JavaScript 来让这段代码运行良好?
请多多指教。
谢谢。
解决方法
您可以将下拉菜单的位置更改为绝对位置并设置左侧和顶部。
.dropdown {
position: absolute;
top: 50%;
left: 50%;
display: inline-block;
transform: translate(-50%,-50%)
}
,
您可以使用:
const { Logging } = require('@google-cloud/logging');
const loggingClient = new Logging();
( 在现实世界的场景中,您会将其应用于容器元素而不是整个主体)
body {
display: flex;
justify-content: center;
}
body {
display: flex;
justify-content: center;
}
.dropbtn {
background-color: #04AA6D;
color: white;
padding: 16px;
font-size: 16px;
border: none;
min-width: 110px;
font-weight: bold;
vertical-align: middle;
margin: 0 auto;
}
.dropdown {
position: relative;
display: inline-block;
}
.dropdown-content {
display: none;
position: center;
background-color: #f1f1f1;
min-width: 110px;
box-shadow: 0px 8px 16px 0px rgba(0,0.2);
z-index: 1;
text-align: center;
}
.dropdown-content a {
color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
}
.dropdown-content a:hover {
background-color: #ddd;
}
.dropdown:hover .dropdown-content {
display: block;
}
.dropdown:hover .dropbtn {
background-color: #3e8e41;
}
你也可以使用这个简单的方法:
.dropdown {
position: relative;
display: inline-block;
text-align: center;
width: 100%;
}
,
.dropbtn {
background-color: #04AA6D;
color: white;
padding: 16px;
font-size: 16px;
border: none;
min-width: 110px;
font-weight: bold;
vertical-align: middle;
}
.dropdown {
position: relative;
display: inline-block;
}
.dropdown-content {
display: none;
position: center;
background-color: #f1f1f1;
min-width: 110px;
box-shadow: 0px 8px 16px 0px rgba(0,0.2);
z-index: 1;
text-align: center;
}
.dropdown-content a {
color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
}
.dropdown-content a:hover {background-color: #ddd;}
.dropdown:hover .dropdown-content {display: block;}
.dropdown:hover .dropbtn {background-color: #3e8e41;}
.dropdown{
display:flex;
flex-direction:column;
justify-content:center;
align-items:center;
border:solid 2px green;
height:100vh;
}
<!DOCTYPE html>
<html>
<div class="dropdown">
<button class="dropbtn">Dropdown</button>
<div class="dropdown-content">
<a href="#">Link 1</a>
<a href="#">Link 2</a>
<a href="#">Link 3</a>
</div>
</div>
</html>