title: bootstrap link conflicting each other
body: <p>I am working on project and i join the project in middle, the project have bootstrap offline bootstrap.min.js file. 
  Now I am doing the some changes and making new pages in my website. but when I use some thing like modal or well in my project and then bootstrap not working and when I used online bootstrap link or cdn then modal and well work. but previous work or pages get effected. why offline bootstrap not working in my webpage. </p>
  
  <p>This is my offline bootstrap file</p>
  
  <pre><code>&lt;link href="&lt;?php echo base_url();?&gt;assets/styles/maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" rel="stylesheet" &gt;
  </code></pre>
  
  <p>and this my online link.</p>
  
  <pre><code>&lt;link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.0/css/bootstrap.min.css"&gt;
  </code></pre>
  
  <p>how to avoid conflict between this link. or tell the  better way to deal with this.</p>