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              <section id="calculator">
        <div class="main-area">
            <div id="calc-title">ONLINE CALCULATOR</div>
            <div class="display">
                <!--div id="result">0</div-->
                <input type="text" name="calc-input" id="result" value='0' readonly>
                <!--div id="hints">hints</div-->
            </div>

            <div class="first-row">
                <button class="all-buttons button clear-button" id='ac' onclick="clearAll()">AC</button>
                <button class="all-buttons button clear-button" id='ac' onclick="clearEntry()">CE</button>
                <button class="all-buttons button sign" id='ac' data-sign="/">/</button>
                <button class="all-buttons button sign" id='ac' data-sign="*">X</button>
            </div>
            <div class="second-row">
                <button class="all-buttons button press" id='ac' data-number="7">7</button>
                <button class="all-buttons button press" id='ac' data-number="8">8</button>
                <button class="all-buttons button press" id='ac' data-number="9">9</button>
                <button class="all-buttons button sign" id='ac' data-sign="-">-</button>
            </div>
            <div class="third-row">
                <button class="all-buttons button press" id='ac' data-number="4">4</button>
                <button class="all-buttons button press" id='ac' data-number="5">5</button>
                <button class="all-buttons button press" id='ac' data-number="6">6</button>
                <button class="all-buttons button sign" id='plus' data-sign="+">+</button>
            </div>

            <div class="fourth-row">
                <button class="all-buttons button press" id='ac' data-number="1">1</button>
                <button class="all-buttons button press" id='ac' data-number="2">2</button>
                <button class="all-buttons button press" id='ac' data-number="3">3</button>
                <button class="all-buttons button-result" id='ac' onclick="calc()">=</button>
            </div>
            <div class="fifth-row">
                <button class="all-buttons button-zero press" id='ac' data-number="0">0</button>

                <button class="all-buttons button press" id='ac' data-number=".">.</button>

            </div>




        </div>
        <div class="copyright">
            <p>designed and coded by <a href="http://kamberov.me" target="_blank">Rustam Kamberov</a> </p><br>
            <p>background image by <a href="https://unsplash.com/@thepip?utm_medium=referral&amp;utm_campaign=photographer-credit&amp;utm_content=creditBadge"
                    target="_blank" rel="noopener noreferrer">Francisco Gomes</span></a></p>
        </div>

    </section>

            
          
!
            
              * {
    margin: 0;
    padding: 0;
}

body {
    margin: 0;
    font-family: Courier New, Courier, monospace;
}

#calculator {
    background-image: url('https://source.unsplash.com/kktq8zzmPEo/1600x900');
    background-size: cover;
    background-position: center;
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 0 20px;
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
}

.main-area {
    border: #A9A9A9 1px solid;
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 300px;
    /*height: 400px;*/
    color: #ffffff;
    background: #35424a;
    border-radius: 20px;
    min-height: 400px;
}

#calc-title {
    padding: 20px 20px;
}

.display {
    font-size: 25px;
    width: 260px;
    height: 30px;
    border-radius: 5px;
    background: #ffffff;
    color: black;
    text-align: right;
    margin-bottom: 10px;
}

#result {
    font-size: 25px;
    width: 260px;
    height: 30px;
    border-radius: 5px;
    background: #ffffff;
    color: black;
    text-align: right;
    margin-bottom: 10px;
}

#hints {
    font-size: 15px;
    color: #D3D3D3;
}

.all-buttons {
    font-size: 15px;
    width: 55px;
    height: 40px;
    text-align: center;
    cursor: pointer;
    outline: none;
    color: #ffffff;
    background-color: #696969;
    border-radius: 5px;
    box-shadow: 0 7px #4d4d4d;
    vertical-align: top;
}

.button {
    margin: 7px 2px;
}

.all-buttons:hover {
    background-color: #4d4d4d;
}

.all-buttons:active {
    background-color: #4d4d4d;
    box-shadow: 0 5px #666;
    transform: translateY(2px);
}

.button-result {
    /*padding: 45px 18px;*/
    height: 95px;
    margin: 7px 2px;
    color: #ffffff;
    background-color: #696969;
    border-radius: 5px;
}

.fifth-row {
    margin-top: -55px;
    margin-left: -69px;
}

.button-zero {
    padding: 10px 60px;
    margin: 7px 2px;
    color: #ffffff;
    background-color: #696969;
    border-radius: 5px;
}

.clear-button {
    background-color: #BD0048;
}

.clear-button:hover {
    background-color: #960039;
}

.clear-button:active {
    background-color: #960039;
    box-shadow: 0 5px #666;
    transform: translateY(2px);
}

.copyright {
    margin-top: 20px;
    text-align: center;
    font-size: 10px;
    color: #ffffff;
}

a {
    text-decoration: none;
    color: silver;
}
            
          
!
            
              var resText = '';

function clearAll() {
    $("#result").val('0');
    resText = '';
}

$('.press').click(function () {
    if ($('#result').val() === '0' ||
        resText.slice(-1) === '+' ||
        resText.slice(-1) === '-' ||
        resText.slice(-1) === '/' ||
        resText.slice(-1) === '*' ||
        resText === '') {

        $('#result').val("");
    }

    var number = $(this).data('number');

    $('#result').val(function () {
        resText += number;
        console.log(resText);
        return this.value + number;
    });
});

$('.sign').click(function () {
    if ($('#result').val().slice(-1) === '+' || $('#result').val().slice(-1) === '-' || $('#result').val().slice(-1) === '/' || $('#result').val().slice(-1) === '*') {

    } else {
        var sign = $(this).data('sign');

        $('#result').val(function () {
            resText += sign;
            console.log(sign);
            return this.value;
        });
    }


});

function calc() {
    if (resText.slice(-1) !== '+' &&
        resText.slice(-1) !== '-' &&
        resText.slice(-1) !== '/' &&
        resText.slice(-1) !== '*') {
        console.log(resText);
        console.log(resText.slice(-1));
        var numbers = resText;

        console.log("result: ", eval(resText));
        $('#result').val(eval(resText));
        resText = eval(resText);
    }

}

/*
function one() {
    console.log(typeof $('#result').val());
    if ($('#result').val() === '0') {
        console.log($('#result').val());
        $('#result').val("");
    }
    $("#result").val(function () {
        return this.value + '1';
    });
}

function two() {
    $("#result").append('2');
}

function three() {
    $("#result").append('2');
}*/
            
          
!
999px
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