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我收到了一些關於過去作業的反饋，警告我關於我的圖像模糊。但我無法弄清楚如何解決它。該任務給出了非常清晰的描述，但我做了所有要求的事情。如何修復使用CSS呈現時模糊的圖像？
我必須做的圖像以下：
添加一個名爲yurthero一個新的選擇ID。在CSS代碼聲明中配置300px高度並顯示coast.jpg背景圖像以填充空間（使用background-size：100％100％;）而不重複。
如何阻止我的圖像模糊？在我看來，拉伸迫使它模糊。
下面附加的是html5，css3和我正在使用的圖像。 
/* pacific.css for assignment #3 by Caleb Latimer */
body{
background-color: #FFFFFF;
color : #666666;
font-family: Verdana;
background-image: url(background.jpg);
}
h1{
background-color: #000033;
color : #FFFFFF;
font-family: Georgia;
line-height: 200%;
background-image: url(sunset.jpg);
background-repeat: no-repeat;
padding-left: 20px;
height: 72px;
margin-bottom: 0;
background-position: right;
}
nav{
font-weight: bold;
background-color: #90C7E3;
padding: 5px 5px 5px 5px;
}
h2{
color: #3399CC;
font-family: Georgia;
}
dt{
color: #000033;
font-weight: bold;
}
.resort{
color: #000033;
font-size: 1.2em;
}
footer{
font-size: .70em;
font-style: italic;
text-align: center;
padding: 10px 10px 10px 10px;
}
#wrapper{
width: 80%;
margin-right: auto;
margin-left: auto;
background-color: #ffffff;
min-width: 700px;
max-width: 1024px;
box-shadow: 5px 5px 5px #828282;
}
h3{
color: #000033;
}
main{
padding-left: 20px;
padding-right: 20px;
display:block;
}
#homehero{
background-size: 100% 100%;
height: 300px;
background-image: url(coast.jpg);
background-repeat: no-repeat;
}
#yurthero{
height: 300px;
background-image: url(yurt.jpg);
background-size: 100% 100%;
background-repeat: no-repeat;
}
#trailhero{
height: 300px;
background-image: url(trail.jpg);
background-size: 100% 100%;
background-repeat: no-repeat;
}
nav a{
text-decoration: none;
}<!-- Chapter 4 Homework by Caleb Latimer -->
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Pacific Trails Resort</title>
<link rel="stylesheet" href="pacific.css" /> <!-- Uses the pacific.css stylesheet inside of folder -->
</head>
<body>
<div id="wrapper">
<header>
<h1>Pacific Trails Resort</h1>
</header>
<nav>
<a href="index.html">Home</a>
<a href="yurts.html">Yurts</a>
<a href="activities.html">Activities</a>
<a href="reservations.html">Reservations</a> <!-- Doesn't lead anywhere no requirements given -->
</nav>
<div id ="homehero"></div>
<main>
<h2>Enjoy Nature in Luxury</h2>
<p>
<span class="resort">Pacific Trails Resort</span> offers a special lodging experience on the California North Coast. Relax in serenity with panoramic views of the Pacific Ocean.
</p>
<ul>
<li>Private yurts with decks overlooking the ocean</li>
<li>Activities lodge with fireplace and gift shop</li>
<li>Nightly fine dining at the Overlook Cafe</li>
<li>Heated outdoor pool and whirlpool</li>
<li>Guided hiking tours of the redwoods</li>
</ul>
<div>
<span class="resort">Pacific Trails Resort</span> <br />
12010 Pacific Trails Road <br />
Zephyr, CA 95555<br /><br />
888-555-5555<br />
</div>
</main>
<footer>
Copyright © 2016 Pacific Trails Resort <br />
<a href = "mailto:[email protected]">[email protected]</a>
</footer>
</div>
</body>
</html>