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how to create a simple calculator in html

Qadir 
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Calculator </title>
  </head>

  <!--CSS File-->

  	* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background: #fffbd5; /* fallback for old browsers */
  background: -webkit-linear-gradient(
    to right,
    #b20a2c,
    #fffbd5
  ); /* Chrome 10-25, Safari 5.1-6 */
  background: linear-gradient(
    to right,
    #b20a2c,
    #fffbd5
  ); /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */
}
.container-first {
  position: relative;
  background: #0b8000;
  border-radius: 6px;
  overflow: hidden;
  z-index: 10;
}
.container-first .calculator {
  position: relative;
  display: grid;
}
.container-first .calculator .value {
  grid-column: span 4;
  height: 140px;
  width: 300px;

  border: none;
  padding-left: 1em;

  font-size: 2.5em;

  color: gold;
}
.container-first .calculator span {
  display: grid;
  height: 4.5em;
  font-weight: 900;
  color: rgb(255, 255, 255);
  text-align: center;
  align-items: center;

  font-size: 20px;
  user-select: none;
  border-bottom: 4px solid rgba(255, 255, 255, 0.07);
  border-right: 4px solid rgba(255, 255, 255, 0.07);
}
input[type="text"] {
  color: rgb(255, 136, 0);
  background-color: rgb(156, 40, 40);
}
  <body>
    <div class="container-first">
      <form name="val" class="calculator">
        <input type="text" class="value" name="ans" />
        <span onclick="document.val.ans.value+='4'">4</span>
        <span onclick="document.val.ans.value+='5'">5</span>
        <span onclick="document.val.ans.value+='6'">6</span>


        <span onclick="document.val.ans.value =eval(document.val.ans.value)">
          =
        </span>


        <span onclick="document.val.ans.value+='7'">7</span>
        <span onclick="document.val.ans.value+='8'">8</span>
        <span onclick="document.val.ans.value+='9'">9</span>
        <span onclick="document.val.ans.value+='-'">-</span>

        <span onclick="document.val.ans.value+='1'">1</span>
        <span onclick="document.val.ans.value+='2'">2</span>
        <span onclick="document.val.ans.value+='3'">3</span>

        <span onclick="document.val.ans.value+='/'">/</span>

        <span onclick="document.val.ans.value+='0'">0</span>
        <span onclick="document.val.ans.value=''">C</span>
        <span onclick="document.val.ans.value+='*'">*</span>

        <span onclick="document.val.ans.value+='00'">00</span>

        <span onclick="document.val.ans.value+='+'">+</span>
      </form>
    </div>
  </body>
</html>
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0
9
Natasha 80 points 

                                    &lt;body&gt;
  
   &lt;center&gt;
    &lt;h1 class=&quot;text-danger&quot;&gt;Calculator&lt;/h1&gt; 
    &lt;p class=&quot;q&quot;&gt;Type in the numbers to be added, separate them with commas (,). If 'Invalid' shows, you have not used a number, please clear the box and type numbers&lt;/p&gt;
   &lt;/center&gt;

    &lt;center&gt;
    &lt;h3 style=&quot;font-family: Lucida Sans; color: lightseagreen&quot;&gt;Add&lt;/h3&gt;
    &lt;input class=&quot;addinput&quot; type=&quot;text&quot;&gt;
   &lt;button class=&quot;add&quot; style=&quot;font-family: Lucida Sans; background-color: lightsalmon&quot;&gt;ADD&lt;/button&gt;
   &lt;p class=&quot;p&quot; style=&quot;background-color:lightpink&quot;&gt;Sum is &lt;span class=&quot;result&quot;&gt;&lt;/span&gt;&lt;/p&gt;
   &lt;/center&gt;
 
&lt;center&gt;
    &lt;h3 style=&quot;font-family: Lucida Sans; color: lightseagreen&quot;&gt;Multiply&lt;/h3&gt;
  &lt;input class=&quot;multiplyinput&quot; type=&quot;text&quot;&gt;
  &lt;button class=&quot;multiply&quot; style=&quot;font-family: Lucida Sans; background-color: lightsalmon&quot;&gt;MULTIPLY&lt;/button&gt;
   &lt;p class=&quot;p&quot; style=&quot;background-color:lightpink&quot;&gt;&lt;/p&gt;&gt;Product is &lt;span class=&quot;product&quot;&gt;&lt;/span&gt;&lt;/p&gt;
&lt;/center&gt;

&lt;center&gt;
        &lt;h3 style=&quot;font-family: Lucida Sans; color: lightseagreen&quot;&gt;Subtract&lt;/h3&gt;
    &lt;input class=&quot;subtractinput&quot; type=&quot;text&quot;&gt;
    &lt;button class=&quot;subtract&quot; style=&quot;font-family: Lucida Sans; background-color: lightsalmon&quot;&gt;SUBTRACT&lt;/button&gt;
     &lt;p class=&quot;p&quot; style=&quot;background-color:lightpink&quot;&gt;&lt;/p&gt;&gt;Difference is &lt;span class=&quot;difference&quot;&gt;&lt;/span&gt;&lt;/p&gt;
  &lt;/center&gt;

  &lt;center&gt;
        &lt;h3 style=&quot;font-family: Lucida Sans; color: lightseagreen&quot;&gt;Divide&lt;/h3&gt;
    &lt;input class=&quot;divideinput&quot; type=&quot;text&quot;&gt;
    &lt;button class=&quot;divide&quot; style=&quot;font-family: Lucida Sans; background-color: lightsalmon&quot;&gt;DIVIDE&lt;/button&gt;
     &lt;p class=&quot;p&quot; style=&quot;background-color:lightpink&quot;&gt;&lt;/p&gt;&gt;Quotient is &lt;span class=&quot;quotient&quot;&gt;&lt;/span&gt;&lt;/p&gt;
  &lt;/center&gt;
  
   &lt;script src=&quot;calculator.js&quot;&gt;&lt;/script&gt;

&lt;/body&gt;

0
0
4.2
5
Desty 110 points 

                                    
&lt;!DOCTYPE html&gt;
&lt;html lang=&quot;en&quot;&gt;
&lt;head&gt;
&lt;style&gt;
.contain{
display: flex;
}
#display{
  width: 98%;
  
}
.mathButtons{
  width: 100px;
  height: 40px;
  background-color: rgb(0,0,0,0.3);
  color: white;
}
.mathButtons:hover{
  background-color: DodgerBlue;
  
  }
  #clearButton:hover{
    background-color: orangered;
  }
  #container{
  
    width: 430px;
    height: 300px;

    }
    
    
    .buttondigits{
      background-color:  black;
      color: white;
      height: 40px;
      width: 100px;
    }
    #clearButton{
      width: 100px;
      height: 40px;
      background-color: rgb(0,0,0,0.3);
      font-weight: bold;
    }
	.buttondigits:hover {
background-color: gray;
}

&lt;/style&gt;
&lt;title&gt; standard calculator &lt;/title&gt;
&lt;meta charset=&quot;utf-8&quot;&gt;
&lt;link rel=&quot;stylesheet&quot; href=&quot;cal.css&quot;/&gt;
&lt;/head&gt;
&lt;body&gt;
  
     &lt;div class=&quot;container&quot;&gt;
	&lt;fieldset id=&quot;container&quot;&gt;
	  &lt;form name=&quot;calculator&quot;&gt;
&lt;input type=&quot;text&quot; id=&quot;display&quot; name=&quot;display&quot; readonly&gt;
&lt;br&gt;
&lt;br&gt;
&lt;br&gt;
&lt;div class=&quot;contain&quot;&gt;
&lt;input class=&quot;buttondigits&quot; type=&quot;button&quot; value=&quot;7&quot; onclick=&quot;calculator.display.value += '7'&quot;&gt;
&lt;input class=&quot;buttondigits&quot; type=&quot;button&quot; value=&quot;8&quot; onclick=&quot;calculator.display.value += '8'&quot;&gt;
&lt;input class=&quot;buttondigits&quot; type=&quot;button&quot; value=&quot;9&quot; onclick=&quot;calculator.display.value += '9'&quot;&gt;
&lt;input class=&quot;mathButtons&quot; type=&quot;button&quot; value=&quot;+&quot; onclick=&quot;calculator.display.value += '+'&quot;&gt;
&lt;/div&gt;

&lt;div class=&quot;contain&quot;&gt;
&lt;input class=&quot;buttondigits&quot; type=&quot;button&quot; value=&quot;4&quot; onclick=&quot;calculator.display.value += '4'&quot;&gt;
&lt;input class=&quot;buttondigits&quot; type=&quot;button&quot; value=&quot;5&quot; onclick=&quot;calculator.display.value += '5'&quot;&gt;
&lt;input class=&quot;buttondigits&quot; type=&quot;button&quot; value=&quot;6&quot; onclick=&quot;calculator.display.value += '6'&quot;&gt;
&lt;input class=&quot;mathButtons&quot; type=&quot;button&quot; value=&quot;-&quot; onclick=&quot;calculator.display.value += '-'&quot;&gt;
&lt;/div&gt;

&lt;div class=&quot;contain&quot;&gt;
&lt;input class=&quot;buttondigits&quot; type=&quot;button&quot; value=&quot;1&quot; onclick=&quot;calculator.display.value += '1'&quot;&gt;
&lt;input class=&quot;buttondigits&quot; type=&quot;button&quot; value=&quot;2&quot; onclick=&quot;calculator.display.value += '2'&quot;&gt;
&lt;input class=&quot;buttondigits&quot; type=&quot;button&quot; value=&quot;3&quot; onclick=&quot;calculator.display.value += '3'&quot;&gt;
&lt;input class=&quot;mathButtons&quot; type=&quot;button&quot; value=&quot;*&quot; onclick=&quot;calculator.display.value += '*'&quot;&gt;
&lt;/div&gt;

&lt;div class=&quot;contain&quot;&gt;
&lt;input id=&quot;clearButton&quot; class=&quot;button&quot; type=&quot;button&quot; value=&quot;C&quot; onclick=&quot;calculator.display.value = ''&quot;&gt;
&lt;input class=&quot;buttondigits&quot; type=&quot;button&quot; value=&quot;0&quot; onclick=&quot;calculator.display.value += '0'&quot;&gt;
&lt;input class= &quot;mathButtons&quot; type=&quot;button&quot; value=&quot;=&quot; onclick=&quot;calculator.display.value = eval(calculator.display.value)&quot;&gt;
&lt;input class=&quot;mathButtons&quot; type=&quot;button&quot; value=&quot;/&quot; onclick=&quot;calculator.display.value += '/'&quot;&gt;
&lt;/div&gt;
&lt;/form&gt; 
&lt;/fieldset&gt;
&lt;/div&gt;
&lt;/body&gt;
&lt;/html&gt;

4.2 (5 Votes)
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