适合div的图像尺寸为800 X 600像素。但是我的一些旧图像（肖像画）是300 X 400像素。如果我改变图像大小，它们将失去分辨率。相反，我想改变div大小。那可能吗？如果没有，是否有解决方法？ 我提供的代码可以按照建议运行示例
body {
background: #fff;
color: #666666;
font-family: "Open Sans", sans-serif;
}
a {
color: #18d26e;
transition: 0.5s;
}
a:hover, a:active, a:focus {
color: #18d36e;
outline: none;
text-decoration: none;
}
p {
padding: 0;
margin: 0 0 30px 0;
}
h1, h2, h3, h4, h5, h6 {
font-family: "Montserrat", sans-serif;
font-weight: 400;
margin: 0 0 20px 0;
padding: 0;
}
/* Back to top button */
.back-to-top {
position: fixed;
display: none;
background: #18d26e;
color: #fff;
display: inline-block;
width: 44px;
height: 44px;
text-align: center;
line-height: 1;
font-size: 16px;
border-radius: 50%;
right: 15px;
bottom: 15px;
transition: background 0.5s;
z-index: 11;
}
.back-to-top i {
padding-top: 12px;
color: #fff;
}
@media (max-width: 768px) {
.back-to-top {
bottom: 15px;
}
}
/*--------------------------------------------------------------
# Header
--------------------------------------------------------------*/
#header {
padding: 30px 0;
height: 92px;
position: fixed;
left: 0;
top: 0;
right: 0;
transition: all 0.5s;
z-index: 997;
}
#header.header-scrolled {
background: rgba(0, 0, 0, 0.9);
padding: 20px 0;
height: 72px;
transition: all 0.5s;
}
#header #logo {
float: left;
}
@media (min-width: 1024px) {
#header #logo {
padding-left: 60px;
}
}
#header #logo h1 {
font-size: 34px;
margin: 0;
padding: 0;
line-height: 1;
font-family: "Montserrat", sans-serif;
font-weight: 700;
letter-spacing: 3px;
}
#header #logo h1 a, #header #logo h1 a:hover {
color: #fff;
padding-left: 10px;
border-left: 4px solid #18d26e;
}
#header #logo img {
padding: 0;
margin: 0;
}
@media (max-width: 768px) {
#header #logo h1 {
font-size: 28px;
}
#header #logo img {
max-height: 40px;
}
}
img.scaled {
width: 100%;
}
/*--------------------------------------------------------------
# Navigation Menu
--------------------------------------------------------------*/
/* Nav Menu Essentials */
.nav-menu, .nav-menu * {
margin: 0;
padding: 0;
list-style: none;
}
.nav-menu ul {
position: absolute;
display: none;
top: 100%;
left: 0;
z-index: 99;
}
.nav-menu li {
position: relative;
white-space: nowrap;
}
.nav-menu > li {
float: left;
}
.nav-menu li:hover > ul,
.nav-menu li.sfHover > ul {
display: block;
}
.nav-menu ul ul {
top: 0;
left: 100%;
}
.nav-menu ul li {
min-width: 180px;
}
/* Nav Menu Arrows */
.sf-arrows .sf-with-ul {
padding-right: 30px;
}
.sf-arrows .sf-with-ul:after {
content: "\f107";
position: absolute;
right: 15px;
font-family: FontAwesome;
font-style: normal;
font-weight: normal;
}
.sf-arrows ul .sf-with-ul:after {
content: "\f105";
}
/* Nav Meu Container */
#nav-menu-container {
float: right;
margin: 0;
}
@media (min-width: 1024px) {
#nav-menu-container {
padding-right: 60px;
}
}
@media (max-width: 768px) {
#nav-menu-container {
display: none;
}
}
/* Nav Meu Styling */
.nav-menu a {
padding: 0 8px 10px 8px;
text-decoration: none;
display: inline-block;
color: #fff;
font-family: "Montserrat", sans-serif;
font-weight: 700;
font-size: 13px;
text-transform: uppercase;
outline: none;
}
.nav-menu li:hover > a, .nav-menu > .menu-active > a {
color: #18d26e;
}
.nav-menu > li {
margin-left: 10px;
}
.nav-menu ul {
margin: 4px 0 0 0;
padding: 10px;
box-shadow: 0px 0px 30px rgba(127, 137, 161, 0.25);
background: #fff;
}
.nav-menu ul li {
transition: 0.3s;
}
.nav-menu ul li a {
padding: 10px;
color: #333;
transition: 0.3s;
display: block;
font-size: 13px;
text-transform: none;
}
.nav-menu ul li:hover > a {
color: #18d26e;
}
.nav-menu ul ul {
margin: 0;
}
/* Mobile Nav Toggle */
#mobile-nav-toggle {
position: fixed;
right: 0;
top: 0;
z-index: 999;
margin: 20px 20px 0 0;
border: 0;
background: none;
font-size: 24px;
display: none;
transition: all 0.4s;
outline: none;
cursor: pointer;
}
#mobile-nav-toggle i {
color: #fff;
}
@media (max-width: 768px) {
#mobile-nav-toggle {
display: inline;
}
}
/* Mobile Nav Styling */
#mobile-nav {
position: fixed;
top: 0;
padding-top: 18px;
bottom: 0;
z-index: 998;
background: rgba(0, 0, 0, 0.8);
left: -260px;
width: 260px;
overflow-y: auto;
transition: 0.4s;
}
#mobile-nav ul {
padding: 0;
margin: 0;
list-style: none;
}
#mobile-nav ul li {
position: relative;
}
#mobile-nav ul li a {
color: #fff;
font-size: 13px;
text-transform: uppercase;
overflow: hidden;
padding: 10px 22px 10px 15px;
position: relative;
text-decoration: none;
width: 100%;
display: block;
outline: none;
font-weight: 700;
font-family: "Montserrat", sans-serif;
}
#mobile-nav ul li a:hover {
color: #fff;
}
#mobile-nav ul li li {
padding-left: 30px;
}
#mobile-nav ul .menu-has-children i {
position: absolute;
right: 0;
z-index: 99;
padding: 15px;
cursor: pointer;
color: #fff;
}
#mobile-nav ul .menu-has-children i.fa-chevron-up {
color: #18d26e;
}
#mobile-nav ul .menu-has-children li a {
text-transform: none;
}
#mobile-nav ul .menu-item-active {
color: #18d26e;
}
#mobile-body-overly {
width: 100%;
height: 100%;
z-index: 997;
top: 0;
left: 0;
position: fixed;
background: rgba(0, 0, 0, 0.7);
display: none;
}
/* Mobile Nav body classes */
body.mobile-nav-active {
overflow: hidden;
}
body.mobile-nav-active #mobile-nav {
left: 0;
}
body.mobile-nav-active #mobile-nav-toggle {
color: #fff;
}
/*--------------------------------------------------------------
# Sections
--------------------------------------------------------------*/
/* Sections Header
--------------------------------*/
.section-header h3 {
font-size: 32px;
color: #111;
text-transform: uppercase;
text-align: center;
font-weight: 700;
position: relative;
padding-bottom: 15px;
}
.section-header h3::before {
content: '';
position: absolute;
display: block;
width: 120px;
height: 1px;
background: #ddd;
bottom: 1px;
left: calc(50% - 60px);
}
.section-header h3::after {
content: '';
position: absolute;
display: block;
width: 40px;
height: 3px;
background: #18d26e;
bottom: 0;
left: calc(50% - 20px);
}
.section-header p {
text-align: center;
padding-bottom: 30px;
color: #333;
}
/* Section with background
--------------------------------*/
.section-bg {
background: #f7f7f7;
}
/
/* Portfolio Section
--------------------------------*/
#portfolio {
padding: 60px 0;
}
#portfolio #portfolio-flters {
padding: 0;
margin: 5px 0 35px 0;
list-style: none;
text-align: center;
}
#portfolio #portfolio-flters li {
cursor: pointer;
margin: 15px 15px 15px 0;
display: inline-block;
padding: 10px 20px;
font-size: 12px;
line-height: 20px;
color: #666666;
border-radius: 4px;
text-transform: uppercase;
background: #fff;
margin-bottom: 5px;
transition: all 0.3s ease-in-out;
}
#portfolio #portfolio-flters li:hover, #portfolio #portfolio-flters li.filter-active {
background: #18d26e;
color: #fff;
}
#portfolio #portfolio-flters li:last-child {
margin-right: 0;
}
#portfolio .portfolio-wrap {
box-shadow: 0px 2px 12px rgba(0, 0, 0, 0.08);
transition: 0.3s;
}
#portfolio .portfolio-wrap:hover {
box-shadow: 0px 4px 14px rgba(0, 0, 0, 0.16);
}
#portfolio .portfolio-item {
position: relative;
height: 360px;
overflow: hidden;
}
#portfolio .portfolio-item figure {
background: #000;
overflow: hidden;
height: 240px;
position: relative;
border-radius: 4px 4px 0 0;
margin: 0;
}
#portfolio .portfolio-item figure:hover img {
opacity: 0.4;
transition: 0.3s;
}
#portfolio .portfolio-item figure .link-preview, #portfolio .portfolio-item figure .link-details {
position: absolute;
display: inline-block;
visibility: hidden;
line-height: 1;
text-align: center;
width: 36px;
height: 36px;
background: #fff;
border-radius: 50%;
transition: 0.2s;
}
#portfolio .portfolio-item figure .link-preview i, #portfolio .portfolio-item figure .link-details i {
padding-top: 6px;
font-size: 22px;
color: #333;
}
#portfolio .portfolio-item figure .link-preview:hover, #portfolio .portfolio-item figure .link-details:hover {
background: #18d26e;
}
#portfolio .portfolio-item figure .link-preview:hover i, #portfolio .portfolio-item figure .link-details:hover i {
color: #fff;
}
#portfolio .portfolio-item figure .link-preview {
left: calc(50% - 38px);
top: calc(50% - 18px);
}
#portfolio .portfolio-item figure .link-details {
right: calc(50% - 38px);
top: calc(50% - 18px);
}
#portfolio .portfolio-item figure:hover .link-preview {
visibility: visible;
left: calc(50% - 44px);
}
#portfolio .portfolio-item figure:hover .link-details {
visibility: visible;
right: calc(50% - 44px);
}
#portfolio .portfolio-item .portfolio-info {
background: #fff;
text-align: center;
padding: 30px;
height: 90px;
border-radius: 0 0 3px 3px;
}
#portfolio .portfolio-item .portfolio-info h4 {
font-size: 18px;
line-height: 1px;
font-weight: 700;
margin-bottom: 18px;
padding-bottom: 0;
}
#portfolio .portfolio-item .portfolio-info h4 a {
color: #333;
}
#portfolio .portfolio-item .portfolio-info h4 a:hover {
color: #18d26e;
}
#portfolio .portfolio-item .portfolio-info p {
padding: 0;
margin: 0;
color: #b8b8b8;
font-weight: 500;
font-size: 14px;
text-transform: uppercase;
}<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>TITLE</title>
<meta content="width=device-width, initial-scale=1.0" name="viewport">
<meta content="" name="keywords">
<meta content="" name="description">
<!-- Favicons -->
<link href="img/favicon.png" rel="icon">
<link href="img/apple-touch-icon.png" rel="apple-touch-icon">
<!-- Google Fonts -->
<link href="https://fonts.googleapis.com/css?family=Open+Sans:300,300i,400,400i,700,700i|Montserrat:300,400,500,700" rel="stylesheet">
<!-- Bootstrap CSS File -->
<link href="lib/bootstrap/css/bootstrap.min.css" rel="stylesheet">
<!-- Libraries CSS Files -->
<link href="lib/font-awesome/css/font-awesome.min.css" rel="stylesheet">
<link href="lib/animate/animate.min.css" rel="stylesheet">
<link href="lib/ionicons/css/ionicons.min.css" rel="stylesheet">
<link href="lib/owlcarousel/assets/owl.carousel.min.css" rel="stylesheet">
<link href="lib/lightbox/css/lightbox.min.css" rel="stylesheet">
<!-- Main Stylesheet File -->
<link href="css/StyleSheet.css" rel="stylesheet">
</head>
<body>
<main id="main">
<section id="portfolio" class="section-bg">
<div class="container">
<header class="section-header">
<h3 class="section-title">Our Portfolio</h3>
</header>
<div class="row">
<div class="col-lg-12">
<ul id="portfolio-flters">
<li data-filter="*" class="filter-active">All</li>
<li data-filter=".filter-app">App</li>
<li data-filter=".filter-card">Card</li>
<li data-filter=".filter-web">Web</li>
</ul>
</div>
</div>
<div class="row portfolio-container">
<div class="col-lg-4 col-md-6 portfolio-item filter-app wow fadeInUp">
<div class="position-relative">
<figure>
<img src="img/portfolio/app1.jpg" class="img-fluid" alt="">
<a href="img/portfolio/app1.jpg" data-lightbox="portfolio" data-title="App 1" class="link-preview align-self-lg-center scaled" title="Preview"><i class="ion ion-eye scaled"></i></a>
<a href="img/portfolio/app1.jpg" data-lightbox="portfolio" data-title="App 1" class="link-preview"><i class="ion ion-android-open align-self-lg-center scaled"></i></a>
<figcaption> figure caption...</figcaption>
</figure>
<div class="portfolio-info">
<h4><a href="#">App 1</a></h4>
<p>App</p>
</div>
</div>
</div>
<div class="col-lg-4 col-md-6 portfolio-item filter-app wow fadeInUp" data-wow-delay="0.2s">
<div class="portfolio-wrap">
<figure>
<img src="img/portfolio/image2.jpg" class="img-fluid" alt="">
<a href="img/portfolio/image2.jpg" class="link-preview" data-lightbox="portfolio" data-title="App 2" title="Preview"><i class="ion ion-eye"></i></a>
<a href="#" class="link-details" title="More Details"><i class="ion ion-android-open"></i></a>
</figure>
</div>
</div>
<div class="col-lg-4 col-md-6 portfolio-item filter-web wow fadeInUp" data-wow-delay="0.1s">
<div class="portfolio-wrap">
<figure>
<img src="img/portfolio/web3.jpg" class="img-fluid" alt="">
<a href="img/portfolio/web3.jpg" class="link-preview" data-lightbox="portfolio" data-title="Web 3" title="Preview"><i class="ion ion-eye"></i></a>
<a href="#" class="link-details" title="More Details"><i class="ion ion-android-open"></i></a>
</figure>
<div class="portfolio-info">
<h4><a href="#">Web 3</a></h4>
<p>Web</p>
</div>
</div>
</div>
<div class="col-lg-4 col-md-6 portfolio-item filter-app wow fadeInUp" data-wow-delay="0.2s">
<div class="portfolio-wrap">
<figure>
<img src="img/portfolio/app2.jpg" class="img-fluid" alt="">
<a href="img/portfolio/app2.jpg" class="link-preview" data-lightbox="portfolio" data-title="App 2" title="Preview"><i class="ion ion-eye"></i></a>
<a href="#" class="link-details" title="More Details"><i class="ion ion-android-open"></i></a>
</figure>
<div class="portfolio-info">
<h4><a href="#">App 2</a></h4>
<p>App</p>
</div>
</div>
</div>
<div class="col-lg-4 col-md-6 portfolio-item filter-card wow fadeInUp">
<div class="portfolio-wrap">
<figure>
<img src="img/portfolio/card2.jpg" class="img-fluid" alt="">
<a href="img/portfolio/card2.jpg" class="link-preview" data-lightbox="portfolio" data-title="Card 2" title="Preview"><i class="ion ion-eye"></i></a>
<a href="#" class="link-details" title="More Details"><i class="ion ion-android-open"></i></a>
</figure>
<div class="portfolio-info">
<h4><a href="#">Card 2</a></h4>
<p>Card</p>
</div>
</div>
</div>
<div class="col-lg-4 col-md-6 portfolio-item filter-web wow fadeInUp" data-wow-delay="0.1s">
<div class="portfolio-wrap">
<figure>
<img src="img/portfolio/web2.jpg" class="img-fluid" alt="">
<a href="img/portfolio/web2.jpg" class="link-preview" data-lightbox="portfolio" data-title="Web 2" title="Preview"><i class="ion ion-eye"></i></a>
<a href="#" class="link-details" title="More Details"><i class="ion ion-android-open"></i></a>
</figure>
<div class="portfolio-info">
<h4><a href="#">Web 2</a></h4>
<p>Web</p>
</div>
</div>
</div>
<div class="col-lg-4 col-md-6 portfolio-item filter-app wow fadeInUp" data-wow-delay="0.2s">
<div class="portfolio-wrap">
<figure>
<img src="img/portfolio/app3.jpg" class="img-fluid" alt="">
<a href="img/portfolio/app3.jpg" class="link-preview" data-lightbox="portfolio" data-title="App 3" title="Preview"><i class="ion ion-eye"></i></a>
<a href="#" class="link-details" title="More Details"><i class="ion ion-android-open"></i></a>
</figure>
<div class="portfolio-info">
<h4><a href="#">App 3</a></h4>
<p>App</p>
</div>
</div>
</div>
<div class="col-lg-4 col-md-6 portfolio-item filter-card wow fadeInUp">
<div class="portfolio-wrap">
<figure>
<img src="img/portfolio/card1.jpg" class="img-fluid" alt="">
<a href="img/portfolio/card1.jpg" class="link-preview" data-lightbox="portfolio" data-title="Card 1" title="Preview"><i class="ion ion-eye"></i></a>
<a href="#" class="link-details" title="More Details"><i class="ion ion-android-open"></i></a>
</figure>
<div class="portfolio-info">
<h4><a href="#">Card 1</a></h4>
<p>Card</p>
</div>
</div>
</div>
<div class="col-lg-4 col-md-6 portfolio-item filter-card wow fadeInUp" data-wow-delay="0.1s">
<div class="portfolio-wrap">
<figure>
<img src="img/portfolio/card3.jpg" class="img-fluid" alt="">
<a href="img/portfolio/card3.jpg" class="link-preview" data-lightbox="portfolio" data-title="Card 3" title="Preview"><i class="ion ion-eye"></i></a>
<a href="#" class="link-details" title="More Details"><i class="ion ion-android-open"></i></a>
</figure>
<div class="portfolio-info">
<h4><a href="#">Card 3</a></h4>
<p>Card</p>
</div>
</div>
</div>
<div class="col-lg-4 col-md-6 portfolio-item filter-web wow fadeInUp" data-wow-delay="0.2s">
<div class="portfolio-wrap">
<figure>
<img src="img/portfolio/web1.jpg" class="img-fluid" alt="">
<a href="img/portfolio/web1.jpg" class="link-preview" data-lightbox="portfolio" data-title="Web 1" title="Preview"><i class="ion ion-eye"></i></a>
<a href="#" class="link-details" title="More Details"><i class="ion ion-android-open"></i></a>
</figure>
<div class="portfolio-info">
<h4><a href="#">Web 1</a></h4>
<p>Web</p>
</div>
</div>
</div>
</div>
</div>
</section>
</main>
<a href="#" class="back-to-top"><i class="fa fa-chevron-up"></i></a>
<!-- JavaScript Libraries -->
<script src="lib/jquery/jquery.min.js"></script>
<script src="lib/jquery/jquery-migrate.min.js"></script>
<script src="lib/bootstrap/js/bootstrap.bundle.min.js"></script>
<script src="lib/easing/easing.min.js"></script>
<script src="lib/superfish/hoverIntent.js"></script>
<script src="lib/superfish/superfish.min.js"></script>
<script src="lib/wow/wow.min.js"></script>
<script src="lib/waypoints/waypoints.min.js"></script>
<script src="lib/counterup/counterup.min.js"></script>
<script src="lib/owlcarousel/owl.carousel.min.js"></script>
<script src="lib/isotope/isotope.pkgd.min.js"></script>
<script src="lib/lightbox/js/lightbox.min.js"></script>
<script src="lib/touchSwipe/jquery.touchSwipe.min.js"></script>
<!-- Contact Form JavaScript File -->
<script src="contactform/contactform.js"></script>
<!-- Template Main Javascript File -->
<script src="js/main.js"></script>
</body>
</html>