如何使用选择器选择每个第一个和第四个div以:nth-child向其添加特定样式?
.main{
width:460px;
height:240px;
}
.box{
width:100px;
height:100px;
background:red;
float:left;
margin:10px;
}
/*I tried */
.box:nth-child(n+4),.box:first-child{
margin:10px 10px 10px 0;
}
.box:nth-child(4n){
margin:10px 0px 10px 10px;
}Run Code Online (Sandbox Code Playgroud)
<div class="main">
<div class="box"></div> <!-- margin-left:0px -->
<div class="box"></div>
<div class="box"></div>
<div class="box"></div> <!-- margin-right:0px -->
<div class="box"></div> <!-- margin-left:0px -->
<div class="box"></div>
<div class="box"></div>
<div class="box"></div> <!-- margin-right:0px -->
</div>Run Code Online (Sandbox Code Playgroud)
第二个代码有效,但我遇到第一个问题?
如何选择行中的每个第一个和最后一个 div(行包含四个div)?
我坚持使用这段代码.
.hwrap header .h-position {
top: 0;
left: 0;
bottom: 0;
width: 135px;
position: fixed;
display: flex;
flex-direction: column;
justify-content: space-between;
}
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我试图将图像居中,但它不起作用:(
我使用参数text-align:center;.图像的大小是600x600px,我需要在网站中居中.
我的代码是:
#share-buttons img {
width: 50px;
padding: 5px;
border: 0;
box-shadow: 0;
display: inline;
}
.img-sugar{
width: 600px;
height: 600px;
display: block;
margin: 0 auto
text-align: center;
}Run Code Online (Sandbox Code Playgroud)
<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"/>
<link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
<link href="assets/css-styles/custom-login-style.css" rel="stylesheet">
<div class="container-fluid">
<div class="row">
<div class="col-md-12 text-center">
<img class="img-sugar" src="assets/images/SUGAR.png"/><br><br><br>
</div>
</div>
<div class="row">
<div class="col-md-12 text-center">
<form action="shareimage.php" method="post">
<input class="" type="file" accept="image/*" capture="camera"/>
</form>
</div>
</div>
<div class="row" id="share-buttons">
<div class="col-md-12 text-center">
<!-- Facebook -->
<a href="http://www.facebook.com/sharer.php?u=https://simplesharebuttons.com" target="_blank">
<img …Run Code Online (Sandbox Code Playgroud)我的页面上的按钮居中有些麻烦.
HTML码
.banner {
background-color: #101723;
width: 100%;
padding: 50px 0;
}
.button {
display: inline-block;
width: 20%;
margin: auto;
padding: 16px 0;
text-transform: uppercase;
vertical-align: middle;
border: 3px solid #FFFFFF;
color: #FFFFFF;
text-align: center;
font-weight: bold;
letter-spacing: 2px;
}Run Code Online (Sandbox Code Playgroud)
<section class="banner">
<a href="" target="_blank"><div class="button">BUTTON 1</div></a>
<a href="" target="_blank"><div class="button">BUTTON 2</div></a>
<a href="" target="_blank"><div class="button">BUTTON 3</div></a>
</section>Run Code Online (Sandbox Code Playgroud)
3个按钮应位于容器中心.我尝试了一切,但似乎我错过了一些东西.