header.css包含以下内容
#logo { background: url(../Images/tarot/800.jpg); width:100%;
}
@media only screen and (max-device-width: 480px) {
#logo { background: url(../Images/tarot/400.jpg); width: 100%; }
}
@media only screen and (min-device-width: 1200px){
#logo { background: url(../Images/tarot/1000.jpg); width: 100%; }
}
目前的HTML页面包含
<div class="container-fluid">
<div class="logo"></div>
</div>