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intro.html
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intro.html
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<html>
<head>
<style>
button{
background-color: #e0e0e0;
height: 50px;
width: 50px;
color:black;
font-size: 30;
border-radius: 100px;
margin: 2px;
}
input{
padding: 30px;
background-color:white;
height: 80px;
width:230px;
color:black;
font-size: 30;
border-radius: 20px;
}
div{
border: 1px solid black;
width :250px;
background-color:#bdbdbd;
text-align: center;
color: black;
border-radius: 20px;
}
#per{
background-color:#0d47a1 ;
color: white;
}
#green{ color: white;}
</style>
</head>
<body>
<div>
<h1>Calculator</h1>
<input type="text" id="cal" placeholder="0"/>
<br>
<br>
<button onclick=" document.getElementById('cal').value+=1">1</button>
<button onclick=" document.getElementById('cal').value+='2'">2</button>
<button onclick=" document.getElementById('cal').value+='3'">3</button>
<button id="per" onclick=" document.getElementById('cal').value+='-'">-</button>
<br>
<button onclick=" document.getElementById('cal').value+='4'">4</button>
<button onclick=" document.getElementById('cal').value+='5'">5</button>
<button onclick=" document.getElementById('cal').value+='6'">6</button>
<button id="per" onclick=" document.getElementById('cal').value+='*'">*</button>
<br>
<button onclick=" document.getElementById('cal').value+='7'">7</button>
<button onclick=" document.getElementById('cal').value+='8'">8</button>
<button onclick=" document.getElementById('cal').value+='9'">9</button>
<button id="per" onclick=" document.getElementById('cal').value+='/'">/</button>
<br>
<br>
<button onclick=" document.getElementById('cal').value+='0'"
>0</button>
<button onclick=" document.getElementById('cal').value=''">c</button>
<button onclick=" document.getElementById('cal').value = eval(document.getElementById('cal').value)">=</button>
<button id="green" onclick=" document.getElementById('cal').value+='+'" >+</button>
<br>
</div>
<script>
document.getElementById("green").style.backgroundColor="green" ;
document.getElementById("green").style.height="80px"; </script>
</body>