crea una calculadora en html y ccs
<!DOCTYPE html> <html> <head> <meta charset="utf-8" /> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" type="text/css" media="screen" href="main.css" /> <script src="main.js"></script> </head> <body> <div class="container"> <h1>Calculadora</h1> <span class="result">0</span> <br><br> <form action=""> <input type="text" id="number1"><br><br> <input type="text" id="number2"><br><br> <button type="button" id="sumar">Sumar</button> <button type="button" id="restar">Restar</button> <button type="button" id="