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HTML 

              
                #app
  .calculator
    .header
      .logo Xiasio
      .title
        | Smart neumorphism
        br
        |calculator
    .display
      .display__inner
        .display__outer
          .display__value
            span(v-html="display") 0
    .separator
    .buttons
      .btn.btn_red(@click="clear")
        .btn__inner
          .btn__outer
            span C
      .btn.btn_orange(@click="sign")
        .btn__inner
          .btn__outer
            span +/-
      .btn.btn_orange(@click="percent")
        .btn__inner
          .btn__outer
            span %
      .btn.btn_orange(@click="divide")
        .btn__inner
          .btn__outer
            span ÷
      .btn(@click="append('7')")
        .btn__inner
          .btn__outer
            span 7
      .btn(@click="append('8')")
        .btn__inner
          .btn__outer
            span 8
      .btn(@click="append('9')")
        .btn__inner
          .btn__outer
            span 9
      .btn.btn_orange(@click="times")
        .btn__inner
          .btn__outer
            span X
      .btn(@click="append('4')")
        .btn__inner
          .btn__outer
            span 4
      .btn(@click="append('5')")
        .btn__inner
          .btn__outer
            span 5
      .btn(@click="append('6')")
        .btn__inner
          .btn__outer
            span 6
      .btn.btn_orange(@click="minus")
        .btn__inner
          .btn__outer
            span -
      .btn(@click="append('1')")
        .btn__inner
          .btn__outer
            span 1
      .btn(@click="append('2')")
        .btn__inner
          .btn__outer
            span 2
      .btn(@click="append('3')")
        .btn__inner
          .btn__outer
            span 3
      .btn.btn_orange(@click="add")
        .btn__inner
          .btn__outer
            span +
      .btn.btn_large(@mouseup="append('0')")
        .btn__inner
          .btn__outer
            span 0
      .btn(@click="dot")
        .btn__inner
          .btn__outer
            span .
      .btn.btn_orange(@click="equal")
        .btn__inner
          .btn__outer
            span
              | =
!

CSS 

              
                html, body {
  display: -webkit-box;
  display: flex;
  -webkit-box-align: center;
          align-items: center;
  -webkit-box-pack: center;
          justify-content: center;
  height: 100%;
  font-size: 2vh;
  -webkit-tap-highlight-color: rgba(0,0,0,0);
  -webkit-tap-highlight-color: transparent;

  @media (max-width: 60vh) {
      font-size: 3.4vw; 
  }
}

.calculator {
  position: relative;

  width: 28rem;
  height: 46rem;

  margin: auto;
  padding: 1.875rem;

  border: 0.625rem solid #E8EEF3;
  box-sizing: border-box;
  border-radius: 1.875rem;

  background: linear-gradient(150.1deg, #F4F8FB 0%, #F8F8F8 100%);
  box-shadow: 0.625rem 0.625rem 1.25rem rgba(200, 212, 224, 0.5), -0.625rem -0.625rem 1.25rem #FFFFFF;

  -moz-user-select: none;

   -ms-user-select: none;

       user-select: none;
  -webkit-user-select: none;
}

.header {
  display: -webkit-box;
  display: flex;
  -webkit-box-pack: justify;
          justify-content: space-between;
  margin-bottom: 1.875rem;
}

.logo {
  font-family: TT Norms, sans-serif;
  font-style: normal;
  font-weight: bold;
  font-size: 1.5rem;
  line-height: 1.75rem;
  color: #31456A;
}

.title {
  font-family: TT Norms, sans-serif;
  font-style: normal;
  font-weight: 500;
  font-size: 0.625rem;
  line-height: 0.75rem;
  text-align: right;
  color: #31456A;
}

.display {
  padding: 0.5rem;
  color: rgba(68, 70, 66, 0.8);
  background: linear-gradient(284.34deg, rgba(255, 255, 255, 0.4) 0%, rgba(255, 255, 255, 0) 100%), #E3ECF6;
  box-shadow: -0.625rem -0.625rem 1.25rem #FFFFFF, 0.625rem 0.625rem 1.875rem rgba(200, 212, 224, 0.5);
  border-radius: 1.875rem;

  &__inner {
    padding: 0.0625rem;
    background: linear-gradient(103.33deg, #FFFFFF 0%, #FEFFFF 0.01%, #99A2A4 100%);
    border-radius: 1.375rem;
  }

  &__outer {
    padding: 1.0625rem 1.875rem 0.4375rem;
    background: linear-gradient(108.47deg, #CCD4C6 -0.62%, #C9D3C1 25.06%, #C0CDB5 51.78%, #B3C1A7 78.51%, #AFBDA2 100%);
    border: 0.0625rem solid #727571;
    box-shadow: inset 0rem 0.25rem 0.625rem rgba(0, 0, 0, 0.25);
    border-radius: 1.25rem;
  }

  &__value {
    position: relative;
    font-family: Electronica-Normal, monospace;
    font-style: normal;
    font-weight: normal;
    font-size: 2.5rem;
    text-align: right;
    overflow: hidden;
    letter-spacing: 0.03rem;

    .dot {
      font-size: 0.8em;
      position: relative;
      display: inline-block;
      width: 0;
      overflow: visible;
      left: -0.2rem;
    }

    &:before {
      content: '8888888888888';
      position: absolute;
      top: 0;
      right: 0;
      opacity: 0.15;
    }
  }
}

.separator {
  height: 0.625rem;
  margin: 1.875rem -1.875rem;
  background: #F1F6FB;
  box-shadow: inset 0.3125rem 0.3125rem 0.625rem rgba(200, 212, 224, 0.5), inset -0.3125rem -0.3125rem 0.625rem #FFFFFF;
}

.buttons {
  margin: 0 -0.3125rem;
  -moz-user-select: none;
   -ms-user-select: none;
       user-select: none;
  -webkit-user-select: none;
}

.btn {
  $this: &;
  position: relative;
  display: inline-block;
  margin: 0.3125rem;
  padding: 0.3125rem;
  font-family: TT Norms;
  font-style: normal;
  font-weight: bold;
  font-size: 1.25rem;
  /* identical to box height */
  text-align: center;
  color: rgba(145, 155, 174, 0.8);
  background: #FFFFFF;
  box-shadow: 0.625rem 0.625rem 1.875rem rgba(200, 212, 224, 0.3), -0.625rem -0.625rem 1.25rem #FFFFFF, inset 0.3125rem 0.3125rem 1.25rem #DAE3EB;
  border-radius: 1.625rem;

  cursor: pointer;

  &__inner {
    padding: 0.125rem;
    background: linear-gradient(135deg, #F1F6FB 0%, rgba(255, 255, 255, 0.473958) 53.13%, #FFFFFF 75%, #F1F6FB 100%);
    box-shadow: 0.3125rem 0.3125rem 1.875rem rgba(200, 212, 224, 0.5), -0.625rem -0.625rem 1.25rem #FFFFFF;
    border-radius: 1.375rem;
  }

  &__outer {
    position: relative;

    width: 4.125rem;
    height: 4.125rem;
    overflow: hidden;
    background: linear-gradient(135deg, #F1F6FB 0%, rgba(255, 255, 255, 0.473958) 53.12%, #FFFFFF 75%, #F1F6FB 100%);
    border-radius: 1.25rem;
    -webkit-transition: background, box-shadow;
    transition: background, box-shadow;

    #{$this}_large & {
      width: 10.2rem;
    }

    #{$this}_down & {
      background: #F1F6FB;
      box-shadow: inset 0.3125rem 0.3125rem 0.625rem rgba(200, 212, 224, 0.5), inset -0.3125rem -0.3125rem 0.625rem #FFFFFF;

      span {
        -webkit-transform: scale(0.92);
                transform: scale(0.92);
      }
    }
  }

  span {
    position: relative;
    display: inline-block;
    padding: 1.375rem 0;
    -webkit-transition: -webkit-transform;
    transition: -webkit-transform;
    transition: transform;
    transition: transform, -webkit-transform;
  }

  &_red {
    color: #FFF;

    #{$this} {
      &__inner {
        background: #F73A3A;
        box-shadow: -0.625rem -0.625rem 1.25rem rgba(255, 255, 255, 0.5);
      }
      &__outer {
        background: linear-gradient(135deg, #E81A1A 0%, #FF6868 53.13%, #FD7373 75%, #E81A1A 100%);
      }
    }

    &#{$this}_down #{$this}__outer  {
      background: #FA3E3E;
      box-shadow: inset 0.3125rem 0.3125rem 0.625rem #DB0000, inset -0.3125rem -0.3125rem 0.625rem rgba(255, 255, 255, 0.2);
    }
  }

  &_orange {
    color: #FFF;

    #{$this} {
      &__inner {
        background: #F3831D;
        box-shadow: -0.625rem -0.625rem 1.25rem rgba(255, 255, 255, 0.5);
      }
      &__outer {
        background: linear-gradient(135deg, #E67208 0%, #F89B45 53.12%, #F89C47 75%, #F08828 100%);
      }
    }

    &#{$this}_down #{$this}__outer  {
      background: #F78924;
      box-shadow: inset 0.3125rem 0.3125rem 0.625rem #E36E03, inset -0.3125rem -0.3125rem 0.625rem rgba(255, 255, 255, 0.2);
    }
  }

  &_large {
    text-align: right;

    span {
      padding-right: 1.625rem;
    }
  }
}
!

JS 

              
                new Vue ({
  el: '#app',
  data: () => ({
    current: "0",
    previous: null,
    operator: null,
    operatorClicked: false
  }),
  computed: {
    display() {
      let current = this.current;
      let max = 13;
      if (this.current.indexOf(".") !== -1) max++;
      current = current
        .replace(/^0+(\d)/, '$1')
        .replace(/^\./, '0.')
        .slice(0, max)
        .replace('.', '<span class="dot">,</span>');
      return current || 0;
    }
  },
  mounted() {
    document.querySelectorAll('.btn').forEach(el => {
      const down = e => el.classList.add('btn_down');
      const up = e => el.classList.remove('btn_down');
      el.addEventListener('mousedown', down, false);
      el.addEventListener('touchstart', down, false);
      el.addEventListener('mouseup', up, false);
      el.addEventListener('touchend', up, false);
    });
  },
  methods: {
    clear() {
      this.current = "0";
      this.previous = null;
      this.operator = null;
      this.operatorClicked = false;
    },
    sign() {
      if(this.current && this.current !== 0) {
        this.current = this.current.charAt(0) === "-"
            ? this.current.slice(1)
            : `-${this.current}`;
      }
    },
    percent() {
      if (this.current) this.current = `${parseFloat(this.current) / 100}`;
    },
    append(number) {
      if (this.operatorClicked) {
        this.current = "";
        this.operatorClicked = false;
      }
      this.current = `${this.current}${number}`;
    },
    dot() {
      if (this.current.indexOf(".") === -1) {
        this.append(".");
      }
    },
    setPrevious() {
      this.previous = this.current;
      this.operatorClicked = true;
    },
    divide() {
      this.equal();
      this.operator = (a, b) => b / a;
      this.setPrevious();
    },
    times() {
      this.equal();
      this.operator = (a, b) => a * b;
      this.setPrevious();
    },
    minus() {
      this.equal();
      this.operator = (a, b) => b - a;
      this.setPrevious();
    },
    add() {
      this.equal();
      this.operator = (a, b) => a + b;
      this.setPrevious();
    },
    equal() {
      if (this.previous && this.current && this.operator) {
        this.current = `${this.operator(
          parseFloat(this.current),
          parseFloat(this.previous)
        )}`;
        this.previous = null;
      }
    }
  }
});
!
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