尝试居中显示菜单时，我的脑子屁很大。
衷心感谢任何人能为我提供的帮助。
我的菜单继续在左侧对齐，但需要居中。
每当我在其周围放置一个容器时，就会失去响应能力。
这是我的HTML
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
<meta name="viewport" content="width=device-width,initial-scale=1,shrink-to-fit=no">
<link href="./style.css" rel="stylesheet" type="text/css" />
<script>
/* Toggle between adding and removing the "responsive" class to topnav when the user clicks on the icon */
function myFunction() {
var x = document.getElementById("myTopnav");
if (x.classname === "topnav") {
x.classname += " responsive";
} else {
x.classname = "topnav";
}
}
</script>
</head>
<body>
<div id="header">
<div class="logo"><img src="./images/logo.png"></div>
<div class="topnav" id="myTopnav">
<a href="#">Home</a>
<div class="dropdown">
<button class="dropbtn">gifts
<i class="fa fa-caret-down"></i>
</button>
<div class="dropdown-content">
<a href="#">Link 1</a>
<a href="#">Link 2</a>
<a href="#">Link 3</a>
</div>
</div>
<div class="dropdown">
<button class="dropbtn">Home & Lifestyle
<i class="fa fa-caret-down"></i>
</button>
<div class="dropdown-content">
<a href="#">Link 1</a>
<a href="#">Link 2</a>
<a href="#">Link 3</a>
</div>
</div>
<div class="dropdown">
<button class="dropbtn">Edible
<i class="fa fa-caret-down"></i>
</button>
<div class="dropdown-content">
<a href="#">Link 1</a>
<a href="#">Link 2</a>
<a href="#">Link 3</a>
</div>
</div>
<div class="dropdown">
<button class="dropbtn">Wearable
<i class="fa fa-caret-down"></i>
</button>
<div class="dropdown-content">
<a href="#">Link 1</a>
<a href="#">Link 2</a>
<a href="#">Link 3</a>
</div>
</div>
<div class="dropdown">
<button class="dropbtn">Toys & Games
<i class="fa fa-caret-down"></i>
</button>
<div class="dropdown-content">
<a href="#">Link 1</a>
<a href="#">Link 2</a>
<a href="#">Link 3</a>
</div>
</div>
<div class="dropdown">
<button class="dropbtn">Blog
<i class="fa fa-caret-down"></i>
</button>
<div class="dropdown-content">
<a href="#">Link 1</a>
<a href="#">Link 2</a>
<a href="#">Link 3</a>
</div>
</div>
<div class="dropdown">
<button class="dropbtn">About Us
<i class="fa fa-caret-down"></i>
</button>
<div class="dropdown-content">
<a href="#">Link 1</a>
<a href="#">Link 2</a>
<a href="#">Link 3</a>
</div>
</div>
<a href="javascript:void(0);" class="icon" onclick="myFunction()">☰</a>
</div>
</div>
<!-- END TOP NAV -->
</div>
<!-- END HEADER -->
这是我的CSS
body {
margin:0 auto;
}
.container {
overflow: hidden;
width: 960px;
margin: 0 auto;
}
.logo {
display: block;
color: #000000;
text-align: center;
letter-spacing: .04em;
font-family: 'Quattrocento Sans',sans-serif;
font-size: 40px;
font-weight: 700;
line-height: normal;
padding: 10px 0;
}
.nav-wrap {
overflow: hidden;
width: 100%;
padding: 10px 0;
background: #ffffff;
box-sizing: border-box;
-webkit-backface-visibility: hidden;
text-align:center;
}
/* Add a black background color to the top navigation */
.topnav {
background-color: #fff;
overflow: hidden;
}
/* Style the links inside the navigation bar */
.topnav a {
float: left;
display: block;
color: #b9b9b9;
text-align: center;
padding: 14px 16px;
text-decoration: none;
text-transform: uppercase;
letter-spacing: .07em;
font-family: 'Quattrocento Sans',sans-serif;
font-size: 14px;
font-weight: 400;
line-height: 19px;
}
/* Add an active class to highlight the current page */
.active {
color: 000;
}
/* Hide the link that should open and close the topnav on small screens */
.topnav .icon {
display: none;
color:#b9b9b9;
}
/* Dropdown container - needed to position the dropdown content */
.dropdown {
float: left;
overflow: hidden;
}
/* Style the dropdown button to fit inside the topnav */
.dropdown .dropbtn {
text-transform: uppercase;
letter-spacing: .07em;
font-weight: 400;
line-height: 19px;
font-size:inherit;
border: none;
outline: none;
color: #b9b9b9;
padding: 14px 16px;
background-color: inherit;
font-family: inherit;
margin: 0;
}
/* Style the dropdown content (hidden by default) */
.dropdown-content {
display: none;
position: absolute;
background-color: #f9f9f9;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0,0.2);
z-index: 1;
}
/* Style the links inside the dropdown */
.dropdown-content a {
float: none;
color: #b9b9b9;
padding: 12px 16px;
text-decoration: none;
display: block;
text-align: left;
}
/* Add a dark background on topnav links and the dropdown button on hover */
.topnav a:hover,.dropdown:hover .dropbtn {
color: 000;
}
/* Add a grey background to dropdown links on hover */
.dropdown-content a:hover {
background-color: #ddd;
color: black;
}
/* Show the dropdown menu when the user moves the mouse over the dropdown button */
.dropdown:hover .dropdown-content {
display: block;
}
/* When the screen is less than 600 pixels wide,hide all links,except for the first one ("Home"). Show the link that contains should open and close the topnav (.icon) */
@media screen and (max-width: 600px) {
.topnav a:not(:first-child),.dropdown .dropbtn {
display: none;
}
.topnav a.icon {
float: right;
display: block;
}
}
/* The "responsive" class is added to the topnav with JavaScript when the user clicks on the icon. This class makes the topnav look good on small screens (display the links vertically instead of horizontally) */
@media screen and (max-width: 600px) {
.topnav.responsive {position: relative;}
.topnav.responsive a.icon {
position: absolute;
right: 0;
top: 0;
}
.topnav.responsive a {
float: none;
display: block;
text-align: left;
}
.topnav.responsive .dropdown {float: none;}
.topnav.responsive .dropdown-content {position: relative;}
.topnav.responsive .dropdown .dropbtn {
display: block;
width: 100%;
text-align: left;
}
}
p {font-family: Verdana,Arial,Helvetica,sans-serif; font-size:14px; color:#333; line-height:20px;}
.thick { font-weight: bold;}
.column {
float: left;
width: 285px;
padding: 15px;
}
.row {
width: 945px;
margin: 0 auto;
text-align: center;
}
/* Clear floats after image containers */
.row::after {
content: "";
clear: both;
display: table;
}
hr.short {
width: 285px;
height: 1px;
border: none;
background-color: #dedede;
margin-top: 40px;
}
/* Responsive layout */
@media only screen and (max-width: 767px) {
.column {
width: 100%;
padding: 0px;
}
.row {
width: 100%;
margin: 0 auto;
text-align: center;
}
/* Clear floats after image containers */
.row::after {
content: "";
clear: both;
display: table;
}
}
菜单一直向左移动（可能是float：left），但我无法使它正常工作。
请问有谁能成为当日的英雄吗？