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html,body{ padding:0; margin:0; background:whitesmoke; } .cont{ position:relative; width:100%; padding:0; margin:0; text-align:center; } .calsi{ width:350px; padding:0; margin:100px auto; text-align:center; background:#d82ed8; box-shadow:0px 0px 6px 0px #0006; } .calsi h1{ font-size:40px; font-family:calibri; font-weight:bold; color:white; text-transform:cepitalize; padding:8px 0px; text-align:center; width:100%; background:#222; margin:0 auto; } #inp{ position:relative; width:100%; padding:8px 0px; text-align:center; font-size:16px; font-family:arial; font-weight:normal; color:#222; outline:none; border:none; background:white; } .btns{ position:relative; width:100%; padding:10px 0px; } .btns button{ border:none; outline:none; width:50px; height:50px; font-size:30px; color:#222; vertical-align:middle; border-radius:5px; background:white; margin:10px 5px; display:inline-block; } button{ border:none; outline:none; width:100px; height:50px; font-size:20px; color:#222; border-radius:5px; vertical-align:middle; background:white; margin:10px 5px; display:inline-block; } <div class="cont"> <div class="calsi"> <h1>Calculator</h1> <input type="text" id="inp" placeholder="Enter Value..." readonly=""> <div class="btns"> <button onclick="AT_add(1)">0</button> <button onclick="AT_add(1)">1</button> <button onclick="AT_add(2)">2</button> <button onclick="AT_add(3)">3</button> <button onclick="AT_add(4)">4</button> <button onclick="AT_add(5)">5</button> <button onclick="AT_add(6)">6</button> <button onclick="AT_add(7)">7</button> <button onclick="AT_add(8)">8</button> <button onclick="AT_add(9)">9</button> <button onclick="AT_add('+')">+</button> <button onclick="AT_add('-')">-</button> <button onclick="AT_add('/')">/</button> <button onclick="AT_add('*')">*</button> </div> <button onclick="exe()">=</button> <button onclick="cancel()">⌫</button> <button onclick="cls()">c</button> </div> <script>var val=document.getElementById("inp"); function AT_add(v){ val.value+=v; } function cls(){ val.value=""; } function exe(){ val.value=eval(val.value); } function cancel(){ val.value=val.value.substr(0,val.value.length-1); }</script> ApakaTechnology@128953.html