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HTML 

              
                <div id="calculator">
<div class="element" data-element="file_upload01"><label>file_upload01</label><input id="fileinput" class="calc-prop" data-identifier="file_upload01" type="file" name="properties[file_upload01]"><p id="fileName01">選択されていません</p></div>
<div class="element" data-element="file_upload02"><label>file_upload02</label><input id="fileinput" class="calc-prop" data-identifier="file_upload02" type="file" name="properties[file_upload02]"><p id="fileName02">選択されていません</p></div>
</div>
!

CSS 

              
                #calculator .element {
    padding: 3px 20px;
    box-sizing: border-box;
    display: flex;
    align-items: center;
}
.element[data-element="file_upload01"]>label:before, .element[data-element="file_upload02"]>label:before {
    content: '';
    background: url(https://cdn.shopify.com/s/files/1/0544/8158/4301/files/download-icon.png?v=1661250299&b=allow_avif);
    width: 16px;
    height: 16px;
    display: inline-block;
    top: 3px;
    position: relative;
    margin-right: 5px;
}
#calculator .element[data-element="file_upload01"] label, #calculator .element[data-element="file_upload02"] label {
    display: block !important;
    font-size: 0 !important;
    z-index: 1;
    pointer-events: none;
}
.element[data-element="file_upload01"]>label, .element[data-element="file_upload02"]>label {
    display: none;
    font-size: 14px;
    text-align: center;
    cursor: pointer;
    color: #50AEBA !important;
    border: 2px solid #50aeba;
    border-radius: 20px;
}
.element[data-element="file_upload01"]>label:after, .element[data-element="file_upload02"]>label:after {
    content: 'ファイルを選択';
    font-size: 13px;
    font-weight: bold;
}
#calculator .element[data-element="file_upload01"] label, #calculator .element[data-element="file_upload02"] label{
    width: 80%;
}
.element[data-element="file_upload01"]>label,
.element[data-element="file_upload02"]>label{
    background: #fff;
    padding: 5px 0;
}
.element[data-element="file_upload01"]>label:after,
.element[data-element="file_upload02"]>label:after {
    content: 'ファイルを選択';
    font-size: 13px;
    font-weight: bold;
}
#fileName01,#fileName02 {
    width: 100%;
    text-align: center;
}
.element[data-element="file_upload01"],
.element[data-element="file_upload02"]{
    flex-flow: column;
    margin-bottom: 0 !important;
    padding-top: 10px !important;
}
textarea.calc-prop[name="properties[サイズ内訳]"] {
    min-height: 140px;
}
.element strong {
    font-weight: bold;
}
.element[data-element="file_format"] {
    margin: 10px 20px;
}
.element[data-element="file_upload01"],
.element[data-element="file_upload02"] {
    position: relative;
}

.element[data-element="file_format"] {
    border: 1px solid #ADADAD;
    padding: 0 20px 20px !important;
    margin: 20px;
    width: calc(100% - 40px) !important;
}
.element[data-element="file_format"] label,
.element[data-element="attention_file_upload"] label {
    width: 100% !important;
}
input#fileinput.calc-prop[name="properties[file_upload01]"], input#fileinput.calc-prop[name="properties[file_upload02]"] {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    left: 0;
    letter-spacing: 22px;
}
#calculator .element[data-element="file_upload01"] label.progress-bar, #calculator .element[data-element="file_upload02"] label.progress-bar {
    position: relative;
    overflow: hidden;
}
#calculator .element[data-element="file_upload01"] label.progress-bar:after, #calculator .element[data-element="file_upload02"] label.progress-bar:after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    background: #52aeb9;
    width: 100%;
    height: 100%;
    z-index: 0;
    animation-name: test_box_slide;
    animation-duration:5s;
    animation-fill-mode: forwards;
    transform: translateX(-100%);
}
@keyframes test_box_slide {
  0% {
    transform: translate(-100%,0)
  }
  100% {
    transform: translate(0,0)
  }
}
#calculator .element[data-element="file_upload01"] label.upload-complete, #calculator .element[data-element="file_upload02"] label.upload-complete {
    background: #52aeb9;
}
.element[data-element="file_upload01"]>label.upload-complete:after, .element[data-element="file_upload02"]>label.upload-complete:after {
    content: 'アップロード準備完了';
    color: #fff;
}
@media screen and (max-width: 1024px){
    .element[data-element="file_format"] {
        margin: 20px;
        width: calc(100% - 40px) !important;
    }
    #calculator .element[data-element="file_upload01"] label,
    #calculator .element[data-element="file_upload02"] label {
        width: 100% !important;
        margin: 5px 0 !important;
    }
}
!

JS 

              
                $(function() {
  $('#calculator .element input[type=number]').change( function() {
    if($('#calculator .element input[type=number]').val() == 0 ) {
      $('.section-product-detail__btn-cart').addClass('active');
    } else {
      $('.section-product-detail__btn-cart').removeClass('active');
    }
  });
});

function bytesToSize(bytes) {
   var sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB'];
   if (bytes == 0) return '0 Byte';
   var i = parseInt(Math.floor(Math.log(bytes) / Math.log(1024)));
   return Math.round(bytes / Math.pow(1024, i), 2) + ' ' + sizes[i];
};

    $('input[data-identifier="file_upload01"]').change(function() {
      var file01 = $('#fileinput[data-identifier="file_upload01"]')[0].files[0];
      
      //upload file over 10MB(10240byte) alert
      if(file01.size>10240000){
        window.alert('ファイルが10MBを超えています');
        $(this).val('');
        return;
      }
      //upload file over 10MB(10240byte) alert
      
      $('#calculator .element[data-element="file_upload01"] label').removeClass('upload-complete');
      $('#fileName01').html(file01.name + ' (' + bytesToSize(file01.size) + ')');
      $('#calculator .element[data-element="file_upload01"] label').addClass('progress-bar');
      setTimeout(function(){
        $('#calculator .element[data-element="file_upload01"] label').removeClass('progress-bar');
        $('#calculator .element[data-element="file_upload01"] label').addClass('upload-complete');
      }, 5000); //5 second
    });

    $('input[data-identifier="file_upload02"]').change(function() {
      var file02 = $('#fileinput[data-identifier="file_upload02"]')[0].files[0];
      
      //upload file over 10MB(10240byte) alert
      if(file02.size>10240000){
        window.alert('ファイルが10MBを超えています');
        $(this).val('');
        return;
      }
      //upload file over 10MB(10240byte) alert
      
      $('#calculator .element[data-element="file_upload02"] label').removeClass('upload-complete');
      $('#fileName02').html(file02.name + ' (' + bytesToSize(file02.size) + ')');
      $('#calculator .element[data-element="file_upload02"] label').addClass('progress-bar');
      setTimeout(function(){
        $('#calculator .element[data-element="file_upload02"] label').removeClass('progress-bar');
        $('#calculator .element[data-element="file_upload02"] label').addClass('upload-complete');
      }, 5000); //5 second
    });
!
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