*{
                box-sizing: border-box;
            }
            body {
                font-family: Arial, sans-serif;
                background-color: #f0f0f0;
                margin: 0;
                display: flex;
                justify-content: center;
                align-items: center;
                height: 100vh;
            }
            a{
                padding: 2px 10%;
                border: 1px outset buttonborder;
                border-radius: 10px;
                color: black;
                background-color: gainsboro;
                text-decoration: none;
            }
            .in{
                color: rgb(220, 19, 19);
                font-size: 3rem;
                text-decoration: none;
            }

            .out{
                color: rgb(60, 255, 0);
                font-size: 3rem;
                text-decoration: none;
            }

            .container {
                background-color: #fff;
                padding: 20px;
                border-radius: 5px;
                box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
                text-align: center;
                max-width: 400px;
                width: 100%;
            }

            #calculadora table{
                border-collapse: collapse;
                width: 100%;
                height: 500px;
            }

            #calculadora button,
            #calculadora input{
                width: 100%;
                height: 100%;
                font-size: 2em;
                padding: 10px
            }

            #calculadora input{
                padding: 15px;
                color: black;
                border: none;
                background-color: rgba(179, 174, 174, 0.5);
            }

            #calculadora input:focus{
                outline: none;
            }

            #calculadora button{
                background-color: rgba(0, 0, 0, .4);
                border: none;
                color: white;
                font-weight: bold;
                cursor: pointer;
            }

            #calculadora button:hover{
                background-color: rgba(0, 0, 0, .5);
            }

            #calculadora button:focus{
                outline: none;
            }

            #calculadora button.operacion{
                background-color: green;
            }


            #calculadora button.operacion#clear{
                background-color: red;
            }