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HTML

              
                <!DOCTYPE html>
<html lang="pt-br">

<head>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>Calculadora</title>
	<link rel="stylesheet" type="text/css" href="./css/styles.css">
</head>

<body>
  
	<div class="cal">

		<div class="res">
			<input type="text" readonly id="calc" name="calc" value="0" style="display: none"/>
			<input type="text" readonly id="resultado" name="resultado" value="0"/>
		</div>

		<div class="buttons">
			<div class="num-btn">
				<div>
					<input type="button" value="⥪" class="btn-bs" onclick="bs()">
					<input type="button" value="(" onclick="addOper(value)">
					<input type="button" value=")" onclick="addOper(value)">
				</div>
				<div>
					<input type="button" value="1" id="" name="" onclick="addNum(value)" />
					<input type="button" value="2" id="" name="" onclick="addNum(value)" />
					<input type="button" value="3" id="" name="" onclick="addNum(value)" />
				</div>
				<div>
					<input type="button" value="4" id="" name="" onclick="addNum(value)" />
					<input type="button" value="5" id="" name="" onclick="addNum(value)" />
					<input type="button" value="6" id="" name="" onclick="addNum(value)" />
				</div>
				<div>
					<input type="button" value="7" id="" name="" onclick="addNum(value)" />
					<input type="button" value="8" id="" name="" onclick="addNum(value)" />
					<input type="button" value="9" id="" name="" onclick="addNum(value)" />
				</div>
				<div>
					<input type="button" value="." id="" name="" onclick="addOper(value)" />
					<input type="button" value="0" id="" name="" onclick="addNum(value)" />
					<input type="button" value="c" id="" name="" class="btn-c" onclick="clean()" />
				</div>
			</div>

			<div class="side">
				<input type="button" value="=" onclick="Total()" />
				<input type="button" value="+" placeholder="0" onclick="addOper(value)" />
				<input type="button" value="–" onclick="addOper(value)" />
				<input type="button" value="×" onclick="addOper(value)" />
				<input type="button" value="÷" onclick="addOper(value)" />
			</div>
		</div>
	</div>

	<script type="text/javascript" src="./js/main.js"></script>
</body>

</html>
              
            
!

CSS

              
                @import url('https://fonts.googleapis.com/css?family=Roboto:400,500,700,900');

* {
  margin: 0;
  padding: 0;
}

html,
body {
  height: 100%;
}

body {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
      -ms-flex-flow: column nowrap;
          flex-flow: column nowrap;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  background-image: url("https://backgroundcheckall.com/wp-content/uploads/2017/12/javascript-background-1.jpg");
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.cal {
  background: silver;
  width: 257px;
  padding: 10px;
  border-radius: 10px;
  -webkit-box-shadow: 5px 5px 40px black;
          box-shadow: 5px 5px 40px black;
}
.cal .top-buttons input[type="button"],
.cal .buttons input[type="button"] {
  -webkit-box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.438);
          box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.438);
}
.cal .top-buttons {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: end;
      -ms-flex-pack: end;
          justify-content: flex-end;
}
.cal .top-buttons input[type="button"] {
  width: 57px;
  padding: 15px 0;
  border-radius: 10px;
}
.cal .buttons {
  margin-top: 5px;
}
.cal .side {
  float: left;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
      -ms-flex-flow: column nowrap;
          flex-flow: column nowrap;
  width: 57px;
}
.cal .side input[type="button"] {
  width: 100%;
  padding: 20.5px 0;
  background: #fff;
  color: #212121;
  -webkit-box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.5);
          box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.5);
}
.cal .side input[type="button"]:hover {
  background: #b9b9b9;
}
.cal .side input[type="button"]:focus {
  background: #b9b9b9;
}
.cal .side input[value="="] {
  border-top-right-radius: 10px;
  background: #ff8800;
}
.cal .side input[value="="]:hover {
  background: #008f2b;
}
.cal .side input[value="="]:focus {
  background: #008f2b;
}
.cal .side input[value="/"] {
  border-bottom-right-radius: 10px;
}
.cal .res {
  margin-bottom: 15px;
}
.cal .res input[type="text"] {
  background: none;
  border: 2px solid #212121;
  border-radius: 10px;
  padding: 5px;
  color: #212121;
  width: 243px;
  text-align: right;
  direction: ltr;
  overflow: hidden;
  /* &:focus {
  	box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.41);
  } */
}
.cal .res input[type="text"]:not(:focus) {
  text-align: right;
  direction: rtl;
  unicode-bidi: plaintext;
}
.cal .top-btn input[type="button"] {
  margin: 10px 2.5px 5px;
}
.cal .num-btn {
  float: left;
  width: 200px;
}
.cal .num-btn div {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: horizontal;
  -webkit-box-direction: normal;
      -ms-flex-flow: row nowrap;
          flex-flow: row nowrap;
  width: 100%;
}
.cal .num-btn div input[type="button"] {
  -webkit-box-flex: 1;
      -ms-flex: 1;
          flex: 1;
}
.cal .num-btn div .btn-bs {
  border-top-left-radius: 10px;
}
.cal .num-btn div input[value="."] {
  border-bottom-left-radius: 10px;
}
.cal .num-btn div .btn-c {
  background: #ff2929;
}
.cal .num-btn div .btn-c:hover {
  background: #b40000;
}
.cal .num-btn div .btn-c:focus {
  background: #b40000;
}

.top-btn {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
}

input {
  font-size: 20px;
  outline: none;
}

input[type="button"] {
  background: #212121;
  color: #fff;
  border: none;
  height: 64px;
  text-transform: uppercase;
}
input[type="button"]:hover {
  -webkit-transition: .2s;
  transition: .2s;
  background: #2e2e2e;
}
input[type="button"]:focus {
  -webkit-transition: .2s;
  transition: .2s;
  background: #2e2e2e;
}

              
            
!

JS

              
                res = document.getElementById("resultado");
calc = document.getElementById('calc');

//converte o valor do input e transforma em calculo.
function Total() {
	var resv = res.value;
	var calcv = calc.value;

	res.value = eval(calcv);
	calc.value = eval(calcv);
}

//resgata o sinal de operação e adiciona ao input.
function addOper(oper) {
	slc = res.value;
	sOpers = " " + oper + " ";

	if (res.value == "0") {
		res.value = '';
		calc.value = '';
	}

	if (slc.slice(-1) == ")") {
		switch (oper) {
			case "+":
				res.value = res.value + sOpers;
				calc.value = calc.value + oper;
				break;
			case "–":
				res.value = res.value + "-";
				calc.value = calc.value + "-";
				break;
			case "×":
				res.value = res.value + sOpers;
				calc.value = calc.value + "*";
				break;
			case "÷":
				res.value = res.value + sOpers;
				calc.value = calc.value + "/";
				break;
			default:
				break;
		}
	} else if (isNaN(slc.slice(-1)) || slc.slice(-1) == " ") {
		res.value = res.value;
		calc.value = calc.value;
	} else {
		switch (oper) {
			case "+":
				res.value = res.value + sOpers;
				calc.value = calc.value + oper;
				break;
			case "–":
				res.value = res.value + "-";
				calc.value = calc.value + "-";
				break;
			case "×":
				res.value = res.value + sOpers;
				calc.value = calc.value + "*";
				break;
			case "÷":
				res.value = res.value + sOpers;
				calc.value = calc.value + "/";
				break;
			default:
				res.value = res.value + oper;
				calc.value = calc.value + oper;
				break;
		}

	}
}

//reculpera o valor do botão que fez a ação e adiciona no input.
function addNum(num) {

	//se o valor do input for '0' ele limpa e adiciona o valor resgatado.
	if (res.value == "0") {
		res.value = "";
		calc.value = "";
		res.value = parseInt(num);
		calc.value = parseInt(num);
	} else {
		//caso não seja zero, ele busca o valor atual e concatena com o digitado.
		res.value = res.value + parseInt(num);
		calc.value = calc.value + parseInt(num);
	}
}

//exclui os 3 ultimos ou O ultimo caractere do input, dando a função do backspace
function bs() {
	var resv = document.getElementById('resultado').value;
	var clv = document.getElementById('calc').value;

	//caso o ultimo caractere seja um espaço em branco, ele deleta os 3 ultimos caracteres.
	if (resv.slice(-1) == " ") {
		document.getElementById('resultado').value = resv.substring(0, resv.length - 3);
		document.getElementById('calc').value = clv.substring(0, clv.length - 1);
	} else { //caso não seja, ele deleta apenas o ultimo caractere.
		document.getElementById('resultado').value = resv.substring(0, resv.length - 1);
		document.getElementById('calc').value = clv.substring(0, clv.length - 1);
	}


	//caso não sobre nenhum caractere, ele reseta para o '0'.
	if (res.value == "") {
		calc.value = "0";
		res.value = "0";
	}
}

//substitui todo o valor do input para '0'.
function clean() {
	res.value = "0";
	calc.value = "0";
}

/***************HOTKEY (atalhos no teclado)***************/

//função que lê clicks no teclado.
document.onkeyup = function (e) {
	slc = res.value;
	switch (e.which) {
		case 97://caso a tecla pressionada for key97 (numero 1)
			if (res.value == "0") {
				res.value = "";
				calc.value = "";
				res.value = res.value + '1';
				calc.value = calc.value + '1';
			} else {
				res.value = res.value + '1';
				calc.value = calc.value + '1';
			}
			break;
		case 98://caso a tecla pressionada for key98 (numero 2)
			if (res.value == "0") {
				res.value = "";
				calc.value = "";
				res.value = res.value + '2';
				calc.value = calc.value + '2';
			} else {
				res.value = res.value + '2';
				calc.value = calc.value + '2';
			}
			break;
		case 99:
			if (res.value == "0") {
				res.value = "";
				calc.value = "";
				res.value = res.value + '3';
				calc.value = calc.value + '3';
			} else {
				res.value = res.value + '3';
				calc.value = calc.value + '3';
			}
			break;
		case 100:
			if (res.value == "0") {
				res.value = "";
				calc.value = "";
				res.value = res.value + '4';
				calc.value = calc.value + '4';
			} else {
				res.value = res.value + '4';
				calc.value = calc.value + '4';
			}
			break;
		case 101:
			if (res.value == "0") {
				res.value = "";
				calc.value = "";
				res.value = res.value + '5';
				calc.value = calc.value + '5';
			} else {
				res.value = res.value + '5';
				calc.value = calc.value + '5';
			}
			break;
		case 102:
			if (res.value == "0") {
				res.value = "";
				calc.value = "";
				res.value = res.value + '6';
				calc.value = calc.value + '6';
			} else {
				res.value = res.value + '6';
				calc.value = calc.value + '6';
			}
			break;
		case 103:
			if (res.value == "0") {
				res.value = "";
				calc.value = "";
				res.value = res.value + '7';
				calc.value = calc.value + '7';
			} else {
				res.value = res.value + '7';
				calc.value = calc.value + '7';
			}
			break;
		case 104:
			if (res.value == "0") {
				res.value = "";
				calc.value = "";
				res.value = res.value + '8';
				calc.value = calc.value + '8';
			} else {
				res.value = res.value + '8';
				calc.value = calc.value + '8';
			}
			break;
		case 105:
			if (res.value == "0") {
				res.value = "";
				calc.value = "";
				res.value = res.value + '9';
				calc.value = calc.value + '9';
			} else {
				res.value = res.value + '9';
				calc.value = calc.value + '9';
			}
			break;
		case 96:
			if (res.value == "0") {
				res.value = "";
				calc.value = "";
				res.value = res.value + '0';
				calc.value = calc.value + '0';
			} else {
				res.value = res.value + '0';
				calc.value = calc.value + '0';
			}
			break;
		case 190:
			if (res.value == "0") {
				res.value = "";
				calc.value = "";
				res.value = res.value + '.';
				calc.value = calc.value + '.';
			} else {
				if (isNaN(slc.slice(-1)) || slc.slice(-1) == " ") {
					res.value = res.value;
				} else {
					res.value = res.value + '.';
					calc.value = calc.value + '.';
				}
			}
			break;
		case 107:
			if (res.value == "0") {
				res.value = "";
				calc.value = "";
				res.value = res.value + ' + ';
				calc.value = calc.value + '+';
			} else {
				if (slc.slice(-1) == ")") {
					res.value = res.value + ' + ';
					calc.value = calc.value + '+';
				} else if (isNaN(slc.slice(-1)) || slc.slice(-1) == " ") {
					res.value = res.value;
				} else {
					res.value = res.value + ' + ';
					calc.value = calc.value + '+';
				}
			}
			break;
		case 109:
			if (res.value == "0") {
				res.value = "";
				calc.value = "";
				res.value = res.value + ' - ';
				calc.value = calc.value + '-';
			} else {
				if (slc.slice(-1) == ")") {
					res.value = res.value + ' - ';
					calc.value = calc.value + '-';
				} else if (isNaN(slc.slice(-1)) || slc.slice(-1) == " ") {
					res.value = res.value;
				} else {
					res.value = res.value + ' - ';
					calc.value = calc.value + '-';
				}
			}
			break;
		case 106:
		case 88:
			if (res.value == "0") {
				res.value = "";
				calc.value = "";
				res.value = res.value + ' × ';
				calc.value = calc.value + '*';
			} else {
				if (slc.slice(-1) == ")") {
					res.value = res.value + ' × ';
					calc.value = calc.value + '*';
				} else if (isNaN(slc.slice(-1)) || slc.slice(-1) == " ") {
					res.value = res.value;
				} else {
					res.value = res.value + ' × ';
					calc.value = calc.value + '*';
				}
			}
			break;
		case 111:
			if (res.value == "0") {
				res.value = "";
				calc.value = "";
				res.value = res.value + ' ÷ ';
				calc.value = calc.value + '/';
			} else {
				if (slc.slice(-1) == ")") {
					res.value = res.value + ' ÷ ';
					calc.value = calc.value + '/';
				} else if (isNaN(slc.slice(-1)) || slc.slice(-1) == " ") {
					res.value = res.value;
				} else {
					res.value = res.value + ' ÷ ';
					calc.value = calc.value + '/';
				}
			}
			break;
		case e.shiftKey && 57:
			if (res.value == "0") {
				res.value = "";
				calc.value = "";
				res.value = res.value + '(';
				calc.value = calc.value + '(';
			} else {
				if (isNaN(slc.slice(-1)) || slc.slice(-1) == " ") {
					res.value = res.value;
				} else {
					res.value = res.value + '(';
					calc.value = calc.value + '(';
				}
			}
			break;
		case e.shiftKey && 48:
			if (res.value == "0") {
				res.value = "0";
			} else {
				if (isNaN(slc.slice(-1)) || slc.slice(-1) == " ") {
					res.value = res.value;
				} else {
					res.value = res.value + ')';
					calc.value = calc.value + ')';
				}
			}
			break;
		case 13:
			Total();
			break;
		case 8:
			bs();
			break;
		case 46:
		case 67:
			clean();
			break;
		default:
			break;
	}
}
              
            
!
999px

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