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HTML 

              
                <div class="calculator">
   <div class="calculator__screen">
      <h6 class="calculator__operation">1258 + 963</h6>
      <h5 class="calculator__result">2194</h5>
   </div>
   <div class="calculator__buttons">
      <button class="btn highlight">C</button>
      <button class="btn highlight">÷</button>
      <button class="btn highlight">x</button>
      <button class="btn">
         <svg width="20" height="12" viewBox="0 0 20 12" fill="none" xmlns="http://www.w3.org/2000/svg">
            <path fill-rule="evenodd" clip-rule="evenodd" d="M6.141 1.2L1.67588 6L6.141 10.8H18.75V1.2H6.141ZM5.5814 12L0 6L5.5814 0H20V12H5.5814Z" fill="#6B8AFA"/>
            <path fill-rule="evenodd" clip-rule="evenodd" d="M9.17574 3.17574C9.41005 2.94142 9.78995 2.94142 10.0243 3.17574L14.8243 7.97574C15.0586 8.21005 15.0586 8.58995 14.8243 8.82426C14.5899 9.05858 14.2101 9.05858 13.9757 8.82426L9.17574 4.02426C8.94142 3.78995 8.94142 3.41005 9.17574 3.17574Z" fill="#6B8AFA"/>
            <path fill-rule="evenodd" clip-rule="evenodd" d="M14.8243 3.17574C14.5899 2.94142 14.2101 2.94142 13.9757 3.17574L9.17574 7.97574C8.94142 8.21005 8.94142 8.58995 9.17574 8.82426C9.41005 9.05858 9.78995 9.05858 10.0243 8.82426L14.8243 4.02426C15.0586 3.78995 15.0586 3.41005 14.8243 3.17574Z" fill="#6B8AFA"/>
         </svg>
      </button>
      <button class="btn">7</button>
      <button class="btn">8</button>
      <button class="btn">9</button>
      <button class="btn highlight">-</button>
      <button class="btn">4</button>
      <button class="btn">5</button>
      <button class="btn">6</button>
      <button class="btn highlight">+</button>
      <button class="btn">1</button>
      <button class="btn">2</button>
      <button class="btn">3</button>
      <button class="btn equal">=</button>
      <button class="btn">%</button>
      <button class="btn">0</button>
      <button class="btn">.</button>
   </div>
</div>
!

CSS 

              
                $text-color: #699AB6
$text-color-highlight: #6B8AFA
$bg: #E8F5FC
$button-size: 44px

$normal-shadow: 6px 6px 10px rgba(darken($bg, 15%), 0.5), -6px -6px 10px rgba(lighten($bg, 50%), 0.6)
$pressed-shadow: inset 6px 6px 10px rgba(darken($bg, 15%), 0.5), inset -6px -6px 10px rgba(lighten($bg, 50%), 0.6)
$active-shadow: 6px 6px 10px rgba(darken($bg, 15%), 0.5), -6px -6px 10px rgba(lighten($bg, 50%), 0.6), inset 6px 6px 10px rgba(darken($bg, 15%), 0.5), inset -6px -6px 10px rgba(lighten($bg, 50%), 0.6)

body
   display: flex
   justify-content: center
   align-items: center
   min-height: 100vh
   background-color: $bg
   padding: 1rem
   color: $text-color
   
.calculator
   padding: 32px 24px
   width: 240px
   background-color: $bg
   box-shadow: $normal-shadow
   border-radius: 16px
   &__screen
      text-align: right
      padding: 12px 8px
      font-family: monospace
      border-radius: 6px
      background-color: darken($bg, 1%)
      box-shadow: $pressed-shadow
      margin-bottom: 24px
   &__operation
      margin: 0 0 8px 0
      font-weight: 500
      font-size: 16px
      letter-spacing: 2px
   &__result
      font-size: 24px
      margin: 0
      font-weight: 600
      color: $text-color-highlight
      letter-spacing: 2px
   &__buttons
      display: grid
      grid-gap: 16px 12px
      grid-template-columns: repeat(4, $button-size)
      grid-template-rows: repeat(5, $button-size)
      justify-content: center
      .btn
         background-color: $bg
         box-shadow: $normal-shadow
         border: none
         border-radius: 100%
         cursor: pointer
         user-select: none
         outline: none
         color: $text-color
         font-weight: 500
         &:hover
            background-color: darken($bg, 2%)
         &:active:focus
            box-shadow: $pressed-shadow
         &:focus
            box-shadow: $active-shadow
         &.equal
            background-color: $text-color-highlight
            color: white
            box-shadow: 3px 11px 25px rgba(darken($text-color-highlight, 12%), 0.6), -6px -6px 10px rgba(255, 255, 255, 0.6), inset -3px -3px 14px rgba(255, 255, 255, 0.2), inset 8px 8px 14px rgba(darken($text-color-highlight, 12%), 0.5)
            grid-row-start: span 2
            grid-column-start: 4
            border-radius: 50px
            &:hover
               background-color: darken($text-color-highlight, 5%)
            &:active:focus, &:focus
               box-shadow: 3px 11px 25px rgba(darken($text-color-highlight, 20%), 0.6), -6px -6px 10px rgba(lighten($text-color-highlight, 30%), 0.9), inset 3px 11px 15px rgba(darken($text-color-highlight, 20%), 0.5), inset -6px -6px 8px rgba(lighten($text-color-highlight, 20%), 0.5)
         &.highlight
            color: $text-color-highlight
!

JS
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999px

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