<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style type="text/css">
.box1{
width: 400px;
height: 600px;
background-color: #808080;
margin: auto;
border-radius: 20px;
}
#box2{
width: 400px;
height: 50px;
}
.a{
border-radius: 20px;
width: 15px;
height: 15px;
background-color: #0000FF;
float: left;
margin-top: 10px;
}
.red{
background-color: #FF0000;
margin-left: 20px;
}
.green{
background-color: green;
margin-left: 10px;
}
.blue{
background-color: blue;
margin-left: 10px;
}
.box3{
width: 390px;
height: 50px;
background-color: white;
border: #A52A2A 2px solid;
margin: auto;
margin-bottom: 15px;
}
#box4{
width: 390px;
height:470px;
margin: 0 auto;
}
.b{
background-color: #00FFFF;
width: 93px;
height: 90px;
margin: 2px;
float: left;
font-size:30px;
line-height: 90px;
text-align: center;
font-family: "黑体";
}
</style>
</head>
<body>
<div class="box1">
<div id="box2">
<div class="a red"></div>
<div class="a green"></div>
<div class="a blue"></div>
</div>
<div class="box3"></div>
<div id="box4">
<div class="b">AC</div>
<div class="b">+/-</div>
<div class="b">%</div>
<div class="b">÷</div>
<div class="b">7</div>
<div class="b">8</div>
<div class="b">9</div>
<div class="b">*</div>
<div class="b">4</div>
<div class="b">5</div>
<div class="b">6</div>
<div class="b">-</div>
<div class="b">1</div>
<div class="b">2</div>
<div class="b">3</div>
<div class="b">+</div>
<div class="b">0</div>
<div class="b">保留</div>
<div class="b">.</div>
<div class="b">=</div>
</div>
</div>
</body>
</html>
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