如果有人可以請客氣,以幫助我,它可能看起來愚蠢,但即時通訊仍然學習的東西引導,只是編碼一般。林想填補我的形象在超大屏幕,但如果你看看我的形象的不充盈整個超大屏幕,不僅如此,但我也想使它成爲一個小一點在jumbotron中調整圖像大小如何?
<body>
<div class="container" id="header">
<div class="row">
<div class="col-md-12">
<ul class="nav justify-content-end p-4">
<li class="nav-item">
<a class="nav-link active" href="#">HOME</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">ABOUT</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">THE ASAP ADVANTAGE</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">HOW IT WORKS</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">FAQS</a>
</li>
</ul>
</div>
</div>
</div>
<div class="jumbotron">
<img src="heroimage.jpeg" class="img-fluid" alt="Responsive image" id="heroPic">
</div>
--- CSS代碼是---
#header{
background-color: #004157;
height:120px;
width:100%;
}
#heroPic{
opacity: .5;
background-size: cover;
padding:0;
margin:0;
}
剛添加該屬性'寬度:100%;高度:200像素;''到#heroPic' –