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CSS

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HTML 

              
                <div class="main">
  <div class="top">
    
    <div class="top2">
      <a class="mainlogo">XASIO</a>
      <a class="logo">fg-81RS PLUS</a>
      <a class="logo2">natural vcm</a>
    </div>
    
    <div class="top1">
      <div class = "solar">
        <div class="line"></div>
        <div class="line"></div>
        <div class="line"></div>
      </div>
    </div>
    
  </div>
  <textarea rows="4" cols="22" class="screen">
  </textarea>
  
  <div class="controls">
    <div class="button-placeholder">
      <a class="button">7</a>
      <a class="button">4</a>
      <a class="button">1</a>
      <a class="button">0</a>
    </div>

    <div class = "button-placeholder">
      <a class="button">8</a>
      <a class="button">5</a>
      <a class="button">2</a>
      <a class="button">.</a>
    </div>

    <div class = "button-placeholder">
      <a class="button">9</a>
      <a class="button">6</a>
      <a class="button">3</a>
      <a class="operation"></a>
    </div>

    <div class = "button-placeholder">
     <a class="operation" id="division">/</a>
      <a class="operation" id="multiply">x</a>
      <a class="operation" id="plus">+</a>
      <a class="operation" id="minus">-</a>      
    </div>

    <div class = "button-placeholder">
      <a class="operation" id="ac">ac</a>
      <a class="operation"></a>
      <a class="operation"></a>
      <a class="operation" id="equals">=</a>
    </div>
  </div>
</div>
!

CSS 

              
                @import url('https://fonts.googleapis.com/css?family=VT323');
@import url('https://fonts.googleapis.com/css?family=Orbitron');

.main {
  width: 250px;
  height: 380px;
  border-radius: 30px;
  border: 3px solid #b2b2b2;
  box-shadow: 0px 0px 25px 0px black;
  background-color:#494949;
  display:flex;
  flex-direction:column;
  position: absolute;
}

.top {
  align-self:center;
  display: flex;
  width:100%;
}

.top1 {
  flex:1.5;
}

.top2 {
  display:flex;
  flex:1;
  flex-direction:column;
  justify-content:flex-end;
  align-items:flex-start;
}

.mainlogo {
  margin-left:30px;
  color:white;
  margin-bottom:4px;
  font-size:14px;
}

.logo {
  color:white;
  font-size:8px;
  margin-left:30px;
}

.logo2 {
  color:#a35e72;
  font-size:8px;
  margin-left:30px;
}

.solar {
  width:120px;
  height:40px;
  background-color:#4e332c;
  border-radius:10px;
  box-shadow: inset 0px 0px 8px 0px #333333;
  margin-top:15px;
  display:flex;
  margin-left:5px;
}

.line {
  border:1px solid #1c1c1c;
  border-top:none;
  border-bottom:none;
  width:35%;
  height:40px;
}

.line:nth-child(1) {
  border-left:none;
}

.line:nth-child(3) {
  border-right:none;
}

.screen {
  width:200px;
  height:100px;
  background-color:#d4e2e1;
  border-radius:10px;
  align-self: center;
  margin-top:10px;
  box-shadow: inset 0px 0px 7px 0px #595959;
  box-sizing:border-box;
  padding:10px;
  font-size:28px;
  font-family: 'VT323', monospace;
}

.controls {
  display:flex;
  flex-direction:row;
  margin-top:30px;
  margin-left:auto;
  margin-right:auto;
  width:85%;
}

.button-placeholder {
  display:flex;
  flex-direction:column;
  width:20%;
}

.button, .operation {
  user-select:none;
  width:90%;
  height:20px;
  margin-bottom:5px;
  padding-top:4px;
  padding-bottom:4px;
  background-color:#333333;
  color:white;
  /*border-top: 2px solid #7c7c7c;
  border-left:1px solid grey;
  border-right:1px solid grey;*/
  box-shadow: 0px 3px #7c7c7c;
  text-align:center;
  border-radius:10px;
  cursor:default;
  font-family: 'Orbitron', sans-serif;
  font-size:14px;
}

.button:active, .operation:active {
  box-shadow: 0px 1px #878787;
  transform: translateY(2px);
  cursor:default;
}
!

JS 

              
                let result;
let operation = [];//allready present as param
let index = 0;
let numberIndex = 0; //not needed
let operationArr;
let numberArr;
let subArr;
let operationIndex;

function divide() {
  if (operation.indexOf("/") > -1) {
    while (operation.indexOf("/") !== -1) {
      operationIndex = operation.indexOf("/");
      subArr = operation.slice(operationIndex - 1, operationIndex + 2);
      operationArr = subArr.filter(element => element === "+" || element === "-" || element === "/" || element === "*");
      numberArr = subArr.filter(element => element !== "+" && element !== "-" && element !== "*" && element !== "/");
      acc2 = numberArr.reduce(parser);
      operation.splice(operationIndex - 1, 3, acc2);
      index = 0;
    }
  }

}

function multiply() {
  if (operation.indexOf("*") > -1) {
    while (operation.indexOf("*") !== -1) {
      operationIndex = operation.indexOf("*");
      console.log("executor entered for * at index: ", operationIndex);
      subArr = operation.slice(operationIndex - 1, operationIndex + 2);
      operationArr = subArr.filter(element => element === "+" || element === "-" || element === "/" || element === "*");
      numberArr = subArr.filter(element => element !== "+" && element !== "-" && element !== "*" && element !== "/");
      acc2 = numberArr.reduce(parser);
      operation.splice(operationIndex - 1, 3, acc2);
      index = 0;
      console.log("acc2: ", acc2);
      console.log("subArr: " + subArr);
      console.log("numberArr: " + numberArr);
      console.log("operationArr: " + operationArr);
      console.log("operation: " + operation);
    }
  }
}

function add() {
  if (operation.indexOf("+") > -1) {
    while (operation.indexOf("+") !== -1) {
      operationIndex = operation.indexOf("+");
      console.log("executor entered for + at index: ", operationIndex);
      subArr = operation.slice(operationIndex - 1, operationIndex + 2);
      operationArr = subArr.filter(element => element === "+" || element === "-" || element === "/" || element === "*");
      numberArr = subArr.filter(element => element !== "+" && element !== "-" && element !== "*" && element !== "/");
      acc2 = numberArr.reduce(parser);
      operation.splice(operationIndex - 1, 3, acc2);
      index = 0;
      console.log("acc2: ", acc2);
      console.log("subArr: " + subArr);
      console.log("numberArr: " + numberArr);
      console.log("operationArr: " + operationArr);
      console.log("operation: " + operation);
    }
  }
}

function subtract() {
  if (operation.indexOf("-") > -1) {
    while (operation.indexOf("-") !== -1) {
      operationIndex = operation.indexOf("-");
      console.log("executor entered for - at index: ", operationIndex);
      subArr = operation.slice(operationIndex - 1, operationIndex + 2);
      operationArr = subArr.filter(element => element === "+" || element === "-" || element === "/" || element === "*");
      numberArr = subArr.filter(element => element !== "+" && element !== "-" && element !== "*" && element !== "/");
      acc2 = numberArr.reduce(parser);
      operation.splice(operationIndex - 1, 3, acc2);
      index = 0;
      console.log("acc2: ", acc2);
      console.log("subArr: " + subArr);
      console.log("numberArr: " + numberArr);
      console.log("operationArr: " + operationArr);
      console.log("operation: " + operation);
    }
  }
}

function parser(acc, element) {
  console.log("accumalator: ", acc, " element: ", element, " operation: ", operationArr[index], " index: ", index);
  if (operationArr[index] === "/") {
    acc = parseFloat(acc) / parseFloat(element);
    index++;
    return acc;
  }
  if (operationArr[index] === "*") {
    acc = parseFloat(acc) * parseFloat(element);
    index++;
    return acc;
  }
  if (operationArr[index] === "+") {
    acc = parseFloat(acc) + parseFloat(element);
    index++;
    return acc;
  }
  if (operationArr[index] === "-") {
    acc = parseFloat(acc) - parseFloat(element);
    index++;
    return acc;
  }
}

$(".button").on("click", function() {
  if ($(this).text() === ".") {
    if (operation[numberIndex][operation[numberIndex].length - 1] === "." || operation[numberIndex].indexOf(".") > -1) {
      return;
    }

  }
  if (operation[numberIndex] === undefined) {
    operation.push("");
  }
  operation[numberIndex] += $(this).text();
  console.log(operation);
  $(".screen").html(operation);
});
// ADDITION OPERATOR

$("#plus").on("click", function() {
  if (operation.length !== 0) {
    if (operation[operation.length - 1] !== "+" && operation[operation.length - 1] !== "-" && operation[operation.length - 1] !== "*" && operation[operation.length - 1] !== "/") {
      numberIndex += 2;
      operation.push("+");
      console.log(operation);
      $(".screen").html(operation);
    }
  }

});

// MINUS OPERATOR

$("#minus").on("click", function() {
  if (operation.length !== 0) {
    if (operation[operation.length - 1] !== "+" && operation[operation.length - 1] !== "-" && operation[operation.length - 1] !== "*" && operation[operation.length - 1] !== "/") {
      numberIndex += 2;
      operation.push("-");
      console.log(operation);
      $(".screen").html(operation);
    }
  }
});

// MULTIPLICATION OPERATOR

$("#multiply").on("click", function() {
  if (operation.length != 0) {
    if (operation[operation.length - 1] !== "+" && operation[operation.length - 1] !== "-" && operation[operation.length - 1] !== "*" && operation[operation.length - 1] !== "/") {
      numberIndex += 2;
      operation.push("*");
      console.log(operation);
      $(".screen").html(operation);
    }
  }
});

// DIVISION OPERATOR 

$("#division").on("click", function() {
  if (operation.length != 0) {
    if (operation[operation.length - 1] !== "+" && operation[operation.length - 1] !== "-" && operation[operation.length - 1] !== "*" && operation[operation.length - 1] !== "/") {
      numberIndex += 2;
      operation.push("/");
      console.log(operation);
      $(".screen").html(operation);
    }
  }
});

// EQUAL OPERATOR

$("#equals").on("click", function() {
  divide();
  multiply();
  add();
  subtract();
  result = operation;
  console.log("result:", result);
  $(".screen").html(result);
  operation = [];
  operation[0] = result[0];
  index = 0;
  numberIndex = 0;
});

// HELPER OPERATORS

$("#ac").on("click", function() {
  operation = [];
  index = 0;
  numberIndex = 0;
  $(".screen").html("");
  console.log("cleared operation:", operation);
});

$(document).keydown(function(e) {
  switch (e.which) {
    case 96:
    case 48:
      {
        if (operation[numberIndex] === undefined) {
          operation.push("");
        }
        operation[numberIndex] += "0";
        console.log(operation);
        $(".screen").html(operation);
      }
      break;

    case 97:
    case 49:
      {
        if (operation[numberIndex] === undefined) {
          operation.push("");
        }
        operation[numberIndex] += "1";
        console.log(operation);
        $(".screen").html(operation);
      }
      break;

    case 98:
    case 50:
      {
        if (operation[numberIndex] === undefined) {
          operation.push("");
        }
        operation[numberIndex] += "2";
        console.log(operation);
        $(".screen").html(operation);
      }
      break;

    case 99:
    case 51:
      {
        if (operation[numberIndex] === undefined) {
          operation.push("");
        }
        operation[numberIndex] += "3";
        console.log(operation);
        $(".screen").html(operation);
      }
      break;
    case 100:
    case 52:
      {
        if (operation[numberIndex] === undefined) {
          operation.push("");
        }
        operation[numberIndex] += "4";
        console.log(operation);
        $(".screen").html(operation);
      }
      break;
    case 101:
    case 53:
      {
        if (operation[numberIndex] === undefined) {
          operation.push("");
        }
        operation[numberIndex] += "5";
        console.log(operation);
        $(".screen").html(operation);
      }
      break;
    case 102:
    case 54:
      {
        if (operation[numberIndex] === undefined) {
          operation.push("");
        }
        operation[numberIndex] += "6";
        console.log(operation);
        $(".screen").html(operation);
      }
      break;
    case 103:
    case 55:
      {
        if (operation[numberIndex] === undefined) {
          operation.push("");
        }
        operation[numberIndex] += "7";
        console.log(operation);
        $(".screen").html(operation);
      }
      break;
    case 104:
    case 56:
      {
        if (operation[numberIndex] === undefined) {
          operation.push("");
        }
        operation[numberIndex] += "8";
        console.log(operation);
        $(".screen").html(operation);
      }
      break;
    case 105:
    case 57:
      {
        if (operation[numberIndex] === undefined) {
          operation.push("");
        }
        operation[numberIndex] += "9";
        console.log(operation);
        $(".screen").html(operation);
      }
      break;
    case 187:
    case 13:
      {
        divide();
        multiply();
        add();
        subtract();
        result = operation;
        console.log("result:", result);
        $(".screen").html(result);
        operation = [];
        operation[0] = result;
        index = 0;
        numberIndex = 0;
      }
      break;
    case 107:
      {
        if (operation.length !== 0) {
          if (operation[operation.length - 1] !== "+" && operation[operation.length - 1] !== "-" && operation[operation.length - 1] !== "*" && operation[operation.length - 1] !== "/") {
            numberIndex += 2;
            operation.push("+");
            console.log(operation);
            $(".screen").html(operation);
          }
        }

      }
      break;
    case 109:
      {
        if (operation.length != 0) {
          if (operation[operation.length - 1] !== "+" && operation[operation.length - 1] !== "-" && operation[operation.length - 1] !== "*" && operation[operation.length - 1] !== "/") {
            numberIndex += 2;
            operation.push("-");
            console.log(operation);
            $(".screen").html(operation);
          }
        }

      }
      break;
    case 106:
      {
        if (operation.length != 0) {
          if (operation[operation.length - 1] !== "+" && operation[operation.length - 1] !== "-" && operation[operation.length - 1] !== "*" && operation[operation.length - 1] !== "/") {
            numberIndex += 2;
            operation.push("*");
            console.log(operation);
            $(".screen").html(operation);
          }
        }

      }
      break;
    case 111:
      {
        if (operation.length != 0) {
          if (operation[operation.length - 1] !== "+" && operation[operation.length - 1] !== "-" && operation[operation.length - 1] !== "*" && operation[operation.length - 1] !== "/") {
            numberIndex += 2;
            operation.push("/");
            console.log(operation);
            $(".screen").html(operation);
          }
        }

      }
      break;
    case 8:
    case 46:
      {
        operation = [];
        index = 0;
        numberIndex = 0;
        $(".screen").html("");
        console.log("cleared operation:", operation);
      }
      break;
    case 110:
    case 190:
      {
        if (operation[numberIndex][operation[numberIndex].length - 1] === "." || operation[numberIndex].indexOf(".") > -1) {
          return;
        }
        if (operation[numberIndex] === undefined) {
          operation.push("");
        }
        operation[numberIndex] += ".";
        console.log(operation);
        $(".screen").html(operation);
      }
    default:
      return; // exit this handler for other keys
  }
  e.preventDefault(); // prevent the default action (scroll / move caret)
});
!
999px

Console