我想更换几张大图，但是无论放多大的图片都会局限在这个边框里，怎么样才能更改所放图片的大小和位置呢？
下边的图其实我放了一张很大的图，但是都会按比例缩放到这个位置，怎么才能更改默认图片的长宽？和位置？
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<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>CSS3鼠标悬停图片遮罩层动画特效</title>
<!--bootstrap布局框架-->
<link rel="stylesheet" type="text/css" href="css/bootstrap-grid.min.css" />
<!--字体图标样式-->
<link rel="stylesheet" type="text/css" href="https://cdn.bootcss.com/font-awesome/4.6.0/css/font-awesome.min.css">
<style>
body{background-color: #353535}
.box {
font-family: 'Ubuntu', sans-serif;
overflow: hidden;
position: relative;
transition: all 0.3s;
}
.box:hover {
box-shadow: 0 0 15px -5px #000;
}
.box:before {
content: '';
background-color: transparent;
background-image: radial-gradient(circle at 20% 80%, transparent 29%, rgba(255,255,255,0.4) 30%, rgba(255,255,255,0.4) 33%, transparent 34%), radial-gradient(circle at 80% 20%, transparent 29%, rgba(255,255,255,0.4) 30%, rgba(255,255,255,0.4) 33%, transparent 34%);
background-size: 30px 30px;
height: 100%;
width: 100%;
opacity: 0;
position: absolute;
left: 0;
top: 0;
z-index: 1;
transition: all 0.3s ease 0.2s;
}
.box:hover:before {
opacity: 1;
}
.box img {
width: 100%;
height: auto;
transition: all 0.3s ease 0s;
}
.box:hover img {
filter: blur(2px);
}
.box .box-content {
color: #fff;
background-color: rgba(0,0,0,0.6);
text-align: center;
width: 100%;
height: 59%;
padding: 18% 0 0 0;
position: absolute;
left: 0;
top: -100%;
z-index: 2;
transition: all 0.3s ease 0s;
}
.box:hover .box-content {
top: 0;
}
.box .title {
color: #fff;
font-size: 23px;
font-weight: 600;
letter-spacing: 1px;
text-transform: uppercase;
margin: 0;
}
.box .post {
color: #32c287;
font-size: 14px;
font-style: italic;
text-transform: capitalize;
letter-spacing: 2px;
}
.box .icon {
background: rgba(50,194,135,0.6);
text-align: center;
height: 39%;
width: 100%;
padding: 15px 0 0;
margin: 0;
list-style: none;
transform: translateX(50%);
position: absolute;
right: 50%;
bottom: -100%;
z-index: 1;
transition: all 0.3s;
}
.box:hover .icon {
bottom: 0;
}
.box .icon li {
display: inline-block;
margin: 0 3px;
}
.box .icon li a {
color: #32c287;
background-color: #fff;
font-size: 18px;
line-height: 40px;
height: 40px;
width: 40px;
border-radius: 40%;
display: block;
transition: all 0.3s;
}
.box .icon li a:hover {
color: #fff;
background-color: #04a562;
box-shadow: 0 0 0 3px rgba(255,255,255,0.5), 0 0 5px rgba(0,0,0,0.5) inset;
}
@media only screen and (max-width:990px) {
.box {
margin-bottom: 30px;
}
}
@media only screen and (max-width:479px) {
.box .title {
font-size: 20px;
}
}
</style>
</head>
<body>
<h4 style="text-align: center; color: aliceblue;line-height: 50px">CSS3图片鼠标悬停动画特效 <span>Hover Effect Style</span></h4>
<div class="demo">
<div class="container">
<div class="row">
<div class="col-md-4 col-sm-6">
<div class="box">
<img src="images/img-1.jpg" alt="">
<div class="box-content">
<h3 class="title">餐饮软件</h3>
<span class="post">web developer</span>
</div>
<ul class="icon">
<li><a href="#"><i class="fa fa-search"></i></a></li>
<li><a href="#"><i class="fa fa-link"></i></a></li>
</ul>
</div>
</div>
<div class="col-md-4 col-sm-6">
<div class="box">
<img src="images/img-2.jpg" alt="">
<div class="box-content">
<h3 class="title">零售软件</h3>
<span class="post">web designer</span>
</div>
<ul class="icon">
<li><a href="#"><i class="fa fa-search"></i></a></li>
<li><a href="#"><i class="fa fa-link"></i></a></li>
</ul>
</div>
</div>
<div class="col-md-4 col-sm-6">
<div class="box">
<img src="images/img-3.jpg" alt="">
<div class="box-content">
<h3 class="title">会员系统</h3>
<span class="post">web developer</span>
</div>
<ul class="icon">
<li><a href="#"><i class="fa fa-search"></i></a></li>
<li><a href="#"><i class="fa fa-link"></i></a></li>
</ul>
</div>
</div>
</div>
</div>
</div>
<div style="text-align:center;margin:50px 0; font:normal 14px/24px 'MicroSoft YaHei';color:#ffffff">
<p>适用浏览器：360、FireFox、Chrome、Opera、傲游、搜狗、世界之窗. 不支持Safari、IE8及以下浏览器。</p>
<p>来源：<a href="https://www.lanrenzhijia.com/" target="_blank">懒人</a></p>
</div>
</body>
</html>
