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calculator.html
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<html>
<head>
<script>
function insert(num){
document.form.textview.value = document.form.textview.value + num
}
function equal(){
var exp = document.form.textview.value;
if(exp){
document.form.textview.value = eval(exp)
}
}
function c(){
document.form.textview.value = ""
}
function back(){
var exp = document.form.textview.value;
document.form.textview.value = exp.substring(0,exp.length-1);
}
</script>
<style>
*{
margin:0 ;
padding:0 ;
}
.buttoms {
height:100 ;
width:100px ;
font-size: 30px ;
margin:5px ;
cursor:pointer ;
background:#ccd4ff;
}
.textview {
width:440px ;
margin:5px ;
font-size:30px ;
padding:5px ;
}
.main{
position:absolute ;
top:50% ;
left:50% ;
transform:translateX(-50%) translateY(-50%);
}
.bg{
background:linear-gradient(to right, teal, navy);
height:100% ;
}
</style>
</head>
<body>
<div class="main bg">
<form name="form">
<input class="textview" name="textview">
<table>
<tr>
<td><input class="buttoms" type="button" value="c" onclick="c()"></td>
<td><input class="buttoms" type="button" value="<" onclick="back()"></td>
<td><input class="buttoms" type="button" value="/" onclick="insert('/')"></td>
<td><input class="buttoms" type="button" value="*" onclick="insert('*')"></td>
</tr>
<tr>
<td><input class="buttoms" type="button" value="7" onclick="insert(7)"></td>
<td><input class="buttoms" type="button" value="8" onclick="insert(8)"></td>
<td><input class="buttoms" type="button" value="9" onclick="insert(9)"></td>
<td><input class="buttoms" type="button" value="-" onclick="insert('-')"></td>
</tr>
<tr>
<td><input class="buttoms" type="button" value="4" onclick="insert(4)"></td>
<td><input class="buttoms" type="button" value="5" onclick="insert(5)"></td>
<td><input class="buttoms" type="button" value="6" onclick="insert(6)"></td>
<td><input class="buttoms" type="button" value="+" onclick="insert('+')"></td>
</tr>
<tr>
<td><input class="buttoms" type="button" value="1" onclick="insert(1)"></td>
<td><input class="buttoms" type="button" value="2" onclick="insert(2)"></td>
<td><input class="buttoms" type="button" value="3" onclick="insert(3)"></td>
<td rowspan=5><input class="buttoms" style="height:212"type="button" value="=" onclick="equal()"></td>
</tr>
<tr>
<td colspan=2><input class="buttoms" style="width:212"type="button" value="0" onclick="insert(0)"></td>
<td><input class="buttoms" type="button" value="." onclick="insert('.')"></td>
</tr>
</table>
</form>
</div>
</body>
</html>