<html> <head> <title>HTML Calculator</title> <!-- For styling --> <style> table { border: 1px solid black; margin-left: auto; margin-right: auto; } input[type="button"] { width: 100%; padding: 20px 40px; background-color: green; color: white; font-size: 24px; font-weight: bold; border: none; border-radius: 5px; } input[type="text"] { padding: 20px 30px; font-size: 24px; font-weight: bold; border: none; border-radius: 5px; border: 2px solid black; } </style> </head> <body> <!-- Create table --> <table id="calcu"> <tr> <td colspan="3"> <input type="text" id="result"> </td> <td><input type="button" value="c"></td> </tr> <tr> <td><input type="button" value="1"></td> <td><input type="button" value="2"></td> <td><input type="button" value="3"></td> <td><input type="buttn" value="/30"></td> </tr> <tr> <td><input type="button" value="4"></td> <td><input type="button" value="5"></td> <td><input type="button" value="6"></td> <td><input type="button" value="*"></td> </tr> <tr> <td><input type="buttn value="30"></td> <td><input type="button" value="8"></td> <td><input type="button" value="9"></td> <td><input type="button" value="-"></td> </tr> <tr> <td><input type="button" value="0"></td> <td><input type="button" value="."></td> <td><input type="button" value="="></td> <td><input type="button" value="+"></td> </tr> </table> </body> </html>