我遇到了这个div的问题，这个问题在JavaScript中被激活，以显示<a>标签的onclick。它可以在页面底部找到带有小填充背景的文本“This is a test”。通常它只会出现onclick但我暂时禁用它。
我尝试了justify-content和所有常见的事情（我认为）。我有一种感觉，父标签干扰它并给它我不想要它的CSS。如果是这种情况，我使用 Inspect Element 无法找到它。
任何建议都将受到赞赏。
感谢。
var mouseFollowX = 0,
mouseFollowY = 0,
x = 0,
y = 0,
friction = 2 / 30;
function backgroundMover() {
x += (mouseFollowX - x) * friction;
y += (mouseFollowY - y) * friction;
translate = 'translate(' + x + 'px, ' + y + 'px) scale(1.3)';
$('.bg').css({
'-webit-transform': translate,
'-moz-transform': translate,
'transform': translate
});
window.requestAnimationFrame(backgroundMover);
}
$('.wrap').on('mousemove click', function(e) {
var lMouseX = Math.max(-100, Math.min(100, $(window).width() / 2 - e.clientX));
var lMouseY = Math.max(-100, Math.min(100, $(window).height() / 2 - e.clientY));
mouseFollowX = (20 * lMouseX) / 100; // 100 : 12 = lMouxeX : lFollow
mouseFollowY = (10 * lMouseY) / 100;
});
backgroundMover();
function showDevFunction() {
var getDev = document.getElementById("showDev");
if (getDev.style.display === "block") {
getDev.style.display = "none";
} else {
getDev.style.display = "block";
}
}#mainnav {
background-color: #FBFBFB;
}
h1 {
margin-bottom: 0;
padding: 0;
}
.header-brand {
margin-bottom: -8px;
margin-top: 0;
margin-right: 20px;
}
h1.header-brand {
margin-right: 25px;
margin-top: -10px;
margin-left: 20px;
}
.nav-bg {
padding: 33px;
margin: 0;
background: url("../img/home/main-img-header-2.jpg") no-repeat center bottom;
}
h1.hero-heading {
color: white;
position: absolute;
padding-left: 15%;
top: 0.70em;
left: -0.75em;
line-height: 0.8;
font-family: Roboto, sans-serif;
font-size: 10vh;
font-weight: bold;
font-style: italic;
text-transform: uppercase;
text-shadow: 3px 3px 5px black;
}
.hero-heading span {
padding-left: 0.5em;
}
h3.hero-content {
color: white;
position: absolute;
background-color: rgba(53, 79, 92, 0.50);
padding: 0.75em 0.75em 0.75em 15%;
top: 11em;
left: -0.75em;
line-height: 1.5em;
max-width: 76%;
font-family: Roboto Slab, serif;
font-size: 2.5vh;
font-weight: lighter;
font-style: normal;
}
.wrap {
width: 100%;
height: 55vh;
position: relative;
overflow: hidden;
margin-bottom: 35px;
}
.bg {
z-index: -1;
position: static;
background: url("../img/home/main-img-header-2.jpg") no-repeat center bottom;
width: 100%;
height: 55vh;
transform: scale(1.3);
}
.cta {}
img.cta {
opacity: 100;
background: white;
-o-transition: opacity .2s ease-out;
-ms-transition: opacity .2s ease-out;
-moz-transition: opacity .2s ease-out;
-webkit-transition: opacity .2s ease-out;
/* ...and now override with proper CSS property */
transition: opacity .2s ease-out;
}
img.cta:hover {
opacity: 0;
}
.cf {}
.cf img {
position: absolute;
-webkit-transition: opacity 0.2s ease-in-out;
-moz-transition: opacity 0.2s ease-in-out;
-o-transition: opacity 0.2s ease-in-out;
transition: opacity 0.2s ease-in-out;
}
.cf img.top:hover {
opacity: 0;
}
.cta-sub {
position: relative;
margin-top: 200px;
}
.show-more {
width: 80%;
margin-left: auto;
margin-right: auto;
text-align: center;
background-color: lightblue;
position: absolute;
margin: 275px 0 0 0;
}
#showDev {
display: block;
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<!doctype html>
<html lang="en">
<head>
<title>Bootstrap Layouts</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<!-- Bootstrap CSS -->
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css" integrity="sha384-9gVQ4dYFwwWSjIDZnLEWnxCjeSWFphJiwGPXr1jddIhOegiu1FwO5qRGvFXOdJZ4" crossorigin="anonymous">
<!-- Custom CSS -->
<link rel="stylesheet" href="styles/main.css" type="text/css">
<!-- Fonts -->
<link href="https://fonts.googleapis.com/css?family=Roboto:400,400i,700,700i" rel="stylesheet">
<link href="https://fonts.googleapis.com/css?family=Roboto+Slab:300,400,700" rel="stylesheet">
</head>
<body>
<header class="navbar-inverse" role="banner">
<div id="mainnav">
<!-- Can change class="navbar-static-top", to class="navbar-fixed-top" to have nav stuck top -->
<nav class="navbar navbar-expand-lg navbar-light">
<a class="navbar-brand" href="index.html">
<a class="header-brand" href="index.html"><img src="img\main\logo-text-web.png" height="100" width="408"></a>
<!-- <h1 class="header-brand">David Olijnyk <br>Webmaster Services</h1> -->
</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav mr-auto">
<li class="nav-item active">
<a class="nav-link nav-bg" href="#">Home <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Dropdown
</a>
<div class="dropdown-menu" aria-labelledby="navbarDropdown">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#">Disabled</a>
</li>
</ul>
</div>
</nav>
</div>
</header>
<div class="wrap">
<div class="bg"></div>
<h1 class="hero-heading"> your <br> <span>solution</span></h1>
<div class="hero-content-box">
<h3 class="hero-content">Keep your most important business services in one place, with easy and frequent communication. Having an online presence has never been so easy and impactful. </h3>
</div>
</div>
<div class="container">
<div class="row">
<a href="#" class="cf col-4 d-flex justify-content-center" onclick="showDevFunction()">
<img class="cta bottom rounded" src="img/home/dev-more.png">
<img class="cta top rounded" src="img/home/development.png">
</a>
<div class="show-more" id="showDev">
This is a test
</div>
<a href="#" class="cf col-4 d-flex justify-content-center" onclick="showDev">
<img class="cta bottom rounded" src="img/home/photo-more.png">
<img class="cta top rounded" src="img/home/photo.png">
</a>
<a href="#" class="cf col-4 d-flex justify-content-center">
<img class="cta bottom rounded" src="img/home/dev-more.png">
<img class="cta top rounded" src="img/home/development.png">
</a>
</div>
<div class="row cta-sub">
<h3 class="cf col-4 d-flex justify-content-center">Webmaster</h3>
<h3 class="cf col-4 d-flex justify-content-center">Photography</h3>
<h3 class="cf col-4 d-flex justify-content-center">Graphic Design</h3>
</div>
</div>
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
<script src="scripts/main.js"></script>
</body>
</html>
答案 0 :(得分：1)
position:relative的唯一区块是.wrap，因此#showDev相对于正文定位。
将以下position:relative添加到.container元素，#showDev将执行此块的80％。
答案 1 :(得分：1)
我会使用margin：auto和text-align：center。
.nameOfTheDiv{
margin: auto;
text-align: center;
}
这有助于将你的div放在中心位置。
答案 2 :(得分：0)
在您使用show-more和margin-left: auto;的{{1}}课程中。但你再次使用margin-right: auto;
这是操纵先前设定的值。此外，您还必须添加margin: 275px 0 0 0;和left: 0;。
所以，改变如下：
right: 0;答案 3 :(得分：0)
如果您正在寻找像div一样将div居中的东西
div {
position: absolute;
margin: auto;
max-width: 300px;
top: 0;
left: 0;
right: 0;
bottom: 0;
}