html - Calculator keypad layout with flexbox

Question

I am building a calculator with flexbox. I want one of its keys twice the height and another key twice the width.

I googled much about it but couldn't find both cases together.

For twice height key, only answers I found was to make flex-direction as column. But in that case I will not be able to make double width key.

Here is my code (on codepen.io). Please help.

$(function() {
  var curr = "",
    prev = "";
  var updateView = function() {
    $('#curr').html(curr);
    $('#prev').html(prev);
  };
  $('.keysNum').on('click', function(e) {
    curr += $(this).html();
    console.log(this);
    updateView();
  });
  $('.keysOp').on('click', function(e) {

  });
});

.flexBoxContainer {
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  user-select: none;
  display: flex;
  justify-content: space-around;
  align-items: center;
  width: 100%;
  min-height: 100vh;
}

.calculator {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-content: center;
  width: 100%;
  min-height: 100vh;
}

@media (min-width: 321px) {
  .calculator {
    width: 320px;
  }
}

.calculator .keys {
  border: #d3d2cb 0.5px solid;
  background: #fefdff;
  color: #33393d;
  height: 50px;
  height: 14.2857142857vh;
  width: 25%;
  line-height: 14.2857142857vh;
  text-align: center;
  font-size: 1.4rem;
  font-weight: bold;
  transition: background 0.2s linear;
}

.calculator .keysOp {
  background: #f1f1ef;
}

.calculator .keysC {
  color: #f94913;
}

.calculator .keys:hover {
  background: #d3d2cb;
  transition: background 0s linear;
}

.calculator .keys:focus {
  outline: none;
}

.calculator .keys:active {
  background: #93938E;
}

.calculator .screen {
  background: #e9e8e5;
  height: 14.2857142857vh;
  width: 100%;
  line-height: 14.2857142857vh;
  direction: rtl;
}

.calculator .screen:last-child {
  font-size: 4rem;
}

.calculator #anomaly-keys-wrapper {
  display: flex;
  width: 100%;
}

.calculator #anomaly-keys-wrapper>section:first-child {
  display: flex;
  flex-wrap: wrap;
  width: 75%;
}

.calculator #anomaly-keys-wrapper>section:first-child>div.keys {
  flex: 1 0 33.33%;
}

.calculator #anomaly-keys-wrapper>section:first-child>div.long {
  flex-basis: 66.67%;
}

.calculator #anomaly-keys-wrapper>section:last-child {
  width: 25%;
  display: flex;
  flex-direction: column;
}

.calculator #anomaly-keys-wrapper>section:last-child>.tall {
  background: #f94913;
  color: #fefdff;
  width: 100%;
  line-height: 28.5714285714vh;
  flex: 1;
}

.calculator #anomaly-keys-wrapper>section:last-child>.tall:hover {
  background: #c73a0f;
}

.calculator #anomaly-keys-wrapper>section:last-child>.tall:focus {
  outline: none;
}

.calculator #anomaly-keys-wrapper>section:last-child>.tall:active {
  background: #8b280a;
}

<link href="https://cdnjs.cloudflare.com/ajax/libs/ionicons/2.0.1/css/ionicons.min.css" rel="stylesheet" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="flexBoxContainer">
  <div class="calculator">
    <div class="screen" id="prev"></div>
    <div class="screen" id="curr"></div>
    <!--     <div class="keys keysC keysOp" tabindex="2">C</div> -->
    <div class="keys keysC keysOp" tabindex="2">C</div>
    <div class="keys keysOp" tabindex="3"><i class="icon ion-backspace-outline"></i></div>
    <div class="keys keysOp" tabindex="4">&divide</div>
    <div class="keys keysOp" tabindex="5">&times</div>
    <div class="keys keysNum" tabindex="6">7</div>
    <div class="keys keysNum" tabindex="7">8</div>
    <div class="keys keysNum" tabindex="8">9</div>
    <div class="keys keysOp" tabindex="9">-</div>
    <div class="keys keysNum" tabindex="10">4</div>
    <div class="keys keysNum" tabindex="11">5</div>
    <div class="keys keysNum" tabindex="12">6</div>
    <div class="keys keysOp" tabindex="13">+</div>
    <section id="anomaly-keys-wrapper">
      <section>
        <div class="keys keysNum" tabindex="14">1</div>
        <div class="keys keysNum" tabindex="15">2</div>
        <div class="keys keysNum" tabindex="16">3</div>
        <div class="keys long keysNum" tabindex="17">0</div>
        <div class="keys" tabindex="18">.</div>
      </section>
      <section>
        <div class="keys tall" tabindex="19">=</div>
      </section>
    </section>
  </div>
</div>

Answer 1

Wrap the uneven keys in their own flex containers and go from there...

* { box-sizing: border-box; }                                      /* 1 */

.flexBoxContainer {
    display: flex;
    justify-content: space-around;
    align-items: center;
    width: 100%;
}

.calculator {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-content: center;
    width: 100%;
}

.calculator .keys {
    border: red 1px solid;
    height: 50px;
    width: 25%;
    break-inside: avoid;
}

.calculator input {
    height: 100px;
    width: 100%;
    direction: rtl;
}

#anomaly-keys-wrapper {                                            /* 2 */
    display: flex;
    width: 100%; 
}

#anomaly-keys-wrapper > section:first-child {                      /* 3 */
    display: flex;
    flex-wrap: wrap;
    width: 75%;
}

#anomaly-keys-wrapper > section:first-child > div {                /* 4 */
    flex: 1 0 33.33%;
}

#anomaly-keys-wrapper > section:first-child > div:nth-child(4) {   /* 5 */
    flex-basis: 66.67%;
}

#anomaly-keys-wrapper > section:last-child {                       /* 6 */
    width: 25%;
    display: flex;
    flex-direction: column;
}

#anomaly-keys-wrapper .tall {                                      /* 7 */
    width: 100%;
    flex: 1;
}

@media (min-width: 321px) {
    .calculator {
        width: 320px;
    }
}

<div class="flexBoxContainer">
    <div class="calculator">
        <input />
        <div class="keys"></div>
        <div class="keys"></div>
        <div class="keys"></div>
        <div class="keys"></div>
        <div class="keys"></div>
        <div class="keys"></div>
        <div class="keys"></div>
        <div class="keys"></div>
        <div class="keys"></div>
        <div class="keys"></div>
        <div class="keys"></div>
        <div class="keys"></div>
        <section id="anomaly-keys-wrapper">
            <section>
                <div class="keys"></div>
                <div class="keys"></div>
                <div class="keys"></div>
                <div class="keys long"></div>
                <div class="keys"></div>
            </section>
            <section>
                <div class="keys tall"></div>
            </section>
        </section>
    </div>
</div>