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// html code
<div class="upload-section">
  <label for="upload-video">Upload Landing Video</label>
       <input type="file" id="support-files" class="inputfile" data-multiple-caption="{count} files selected" multiple>
               <label for="support-files"><span>Choose a file</span></label>
 </div>
 
 // css
 
 .inputfile {

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// html code
<div class="form-group">
     <div class="input-group input-file" name="Fichier1">
          <input type="text" class="form-control" placeholder='No file selected' />
                  <span class="input-group-btn">
                          <button class="btn btn-default btn-choose" type="button">Upload image</button>
                  </span>
    </div>
</div>

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<!-- Button trigger modal -->
<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#exampleModal">
  Launch demo modal
</button>

<!-- Modal -->
<div class="modal fade" id="exampleModal" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true">
  <div class="modal-dialog" role="document">
    <div class="modal-content">
      <div class="modal-header">

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::-webkit-input-placeholder { /* Chrome/Opera/Safari */
  color: pink;
}
::-moz-placeholder { /* Firefox 19+ */
  color: pink;
}
:-ms-input-placeholder { /* IE 10+ */
  color: pink;
}
:-moz-placeholder { /* Firefox 18- */

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/*npm install*/
first initialize npm with package.json
npm init
then install the node sass
npm install node-sass --save-dev

if already have the package.json initialized with node-sass then just run
npm install

for install live server globally

meetKowshik

npm install create-react-app -g

create-react-app folder-name

then npm start for live view

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First you need to run 
npm run eject
then in config folder you will find webpack-config-devs.js and webpack-config-prod.js, where you will search the css-loader function
paste this code
modules: true,
localIdentName: '[name]__[local]__[hash:base64:5]'

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-go to icomoon.io
-click icomoon app
-scroll to down
- click add icons from library
- then choose encrypto
- then select the icons
- then click generate svg and download
- copy svg icon from svg folder and also copy symbol-defs.svg which will be saved as sprite.svg
in html
<svg>

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longpaths = true

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install gulp 
npm install gulp -g (windows)
sudo npm install gulp -g (mac)

in project file
the structure will be

apps(this folder will be used for developer purpose where all the
css, js, images, fonts, sass file included)