使用CSS将鼠标悬停在按钮上时,如何更改网站的背景图片？

Question

对于学校项目,我们需要使用html,css和PHP制作基本表格.我想在我的网站上添加一些有趣的东西,以使其看起来更令人愉快.我要添加的一件事是,将鼠标悬停在按钮上时页面的背景图像会发生变化.但是,当我尝试添加它时,它什么也没做.
换句话说,我想通过悬停在旋钮上将背景图像从“ lamps.jpg”更改为“ lamps1.jpg”.

需要指出的是,我根本没有在CSS方面的丰富经验,因此我可能会犯一些愚蠢的错误.

我的按钮还有其他悬停代码,可以完成应有的功能.

自从我看过很多视频文章后,我就尝试将其放入文章中.并且还使用：before参数.两者均无济于事.

html{
    font-family: 'Nunito',sans-serif;
}
body{
    background-size: cover;
    color: white;
    letter-spacing: 0.5x;
    background-image: url("https://images.unsplash.com/photo-1518791841217-8f162f1e1131?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&w=1000&q=80");
}
input{
   margin-left: 10%;
}
.text{
    padding: 5px 15px;
    min-width: 200px;
    letter-spacing: 0.3px;
}
.knop{
    padding: 8px 28px;
    border: #dcbc71 2px solid;
    background-color: transparent;
    color: #fff;
    -webkit-transition: border-radius 0.6s;
}
.knop:hover{
    transition: 0.6s;
    border-radius: 10px;
    color: rgba(0,0.5);
    background-color: #fcdd96;
}
fieldset{
    border-radius: 25px;
    border: #dcbc71 2px solid;
    min-height: 600px;
}

<!DOCTYPE html> 
<html lang="nl"> 
	<head>
		<title>Enquete</title>
		<Meta charset="utf-8"> 
		<link rel="stylesheet" href="enq.css">
		<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
		<script>
			$(".knop").hover(function(){
  			$("body").css("background-image","url('https://img.purch.com/w/660/aHR0cDovL3d3dy5saXZlc2NpZW5jZS5jb20vaW1hZ2VzL2kvMDAwLzA4OC85MTEvb3JpZ2luYWwvZ29sZGVuLXJldHJpZXZlci1wdXBweS5qcGVn')");
  			},function(){
  			$("body").css("background-image","url('https://images.unsplash.com/photo-1518791841217-8f162f1e1131?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&w=1000&q=80')");
			});
		</script>
		<link href="https://fonts.googleapis.com/css?family=Nunito" rel="stylesheet">
	</head>
	<body>
		<fieldset>
				<legend><h3>Vrijetijdsbesteding</h3></legend>
				<form name="form" method="post" action ="verstuur.PHP"> 
				<p> Welkom bij deze enquete over vrijetijdsbesteding. Vul het aub eerlijk in zodat wij de best mogelijke resultaten krijgen.
					<table>
					<tr><td>Stad*:</td><td><input type = "text"  name = "stad" placeholder="Stad" class="text" required></td></tr>					
					<tr><td>Leeftijd*:</td><td> <input list="leeftijden" name= "leeftijd" placeholder="Kies een leeftijd" class="text" required>
								<datalist id="leeftijden">
								<option value="0-13">
								<option value="13-18">
								<option value="19-25">
								<option value="26-35">
								<option value="36-45">
								<option value="46-55">
								<option value="56-65">
								<option value="65+">
								</datalist></td></tr>
					<tr><td>Hoeveel uur heb je gemiddeld in de week aan vrije tijd?</td>
								<td><input list="uren" name="uren" placeholder="Kies een uurschatting" class="text" required>
								<datalist id="uren">
								<option value="Geen">
								<option value="1-5">
								<option value="6-10">
								<option value="11-15">
								<option value="16-20">
								<option value="21-25">
								<option value="26-30">
								<option value="30+">
								</datalist></td></tr>
					<tr><td style="vertical-align: top;">Wat doe je in jouw vrije tijd?</td>
							<ul>
							<td><li style="list-style-type: none;"><input type="radio" name= "besteding" value="vrienden" required> Chillen met vrienden</li>
								<li style="list-style-type: none;"><input type="radio" name= "besteding" value="tv"> TV kijken</li>
								<li style="list-style-type: none;"><input type="radio" name= "besteding" value="sport"> Sporten</li>
								<li style="list-style-type: none;"><input type="radio" name= "besteding" value="gamen"> Gamen</li>
								<li style="list-style-type: none;"><input type="radio" name= "besteding" value="lieverniet"> Vertel ik liever niet</li>
								<li style="list-style-type: none;"><input type="radio" name= "besteding" value="Anders" > Anders</li></ul></td></tr>
					<tr><td>Hoeveel uur zit je op je telefoon op een dag?</td>
								<td><input type = "text" size= "25" name = "teltijd" placeholder="Vul een uurschatting in" class="text" required></td></tr>
					<tr><td><p><input type = "submit" name='verstuurd' value = "Verstuur" class="knop"></p> </td></tr>
				</fieldset>
		</form>
		</table>
	</body>
</html>

我期望将鼠标悬停在按钮上以更改背景,但没有做任何不同的事情.

使用CSS将鼠标悬停在按钮上时,如何更改网站的背景图片？

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