1st calculator

 Calculator;

    <div class="container">
        <div class="calculator">
            <div class="display-screen"><div class="display"></div></div>
            <div class="buttons">
                <table>
                    <tr>
                        <td><button class="number seven" id="seven">7</button></td>
                        <td><button class="number eight" id="eight">8</button></td>
                        <td><button class="number nine" id="nine">9</button></td>
                        <td><button class="operator add" id="add">+</button></td>
                    </tr>

                    <tr>
                        <td><button class="number four" id="four">4</button></td>
                        <td><button class="number five" id="five">5</button></td>
                        <td><button class="number six" id="six">6</button></td>
                        <td><button class="operator subtract" id="subtract">-</button></td>
                    </tr>

                    <tr>
                        <td><button class="number one" id="one">1</button></td>
                        <td><button class="number two" id="two">2</button></td>
                        <td><button class="number three" id="three">3</button></td>
                        <td><button class="operator multiply" id="multiply">*</button></td>
                    </tr>

                    <tr>
                        <td><button class="number decimal" id="decimal">.</button></td>
                        <td><button class="number zero" id="zero">0</button></td>
                        <td><button class="operator divide" id="divide">&divide;</button></td>
                        <td><button class="equals" id="equals">=</button></td>
                    </tr>
                </table>
            </div>
        </div>
    </div>


CSS 

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body{
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.calculator{
    width: 300px;
    text-align: center;
}

.display{
    margin-bottom: 2rem;
    width: 100%;
    height: 130px;
    background-color: grey;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    font-size: 3rem;
}

button{
    padding: 2rem 3rem;
    font-size: 4rem;

}


JAVASCRIPT; code + photo;



let buttons = document.querySelectorAll("button");
let display = document.querySelector(".display");

for(let i=0;i<buttons.length;i++){
    buttons[i].addEventListener("click", function(){
        if(this.innerHTML == "="){
            display.innerHTML = eval(display.innerHTML)
        }

        else{
            if(this.innerHTML == "÷"){
                display.innerHTML += "/";
            }

            else{
                display.innerHTML += this.innerHTML;
            }
        }

        })
}

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