title: Font won't change in CSS / HTML?
body: <p>I'm working on a website with PHP and MySQL. I've been activley trying to change the font, but no matter what I do, it won't change. Here is my main CSS file:</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-css lang-css prettyprint-override"><code>header {
      border: 4px solid black;
      text-align: center;
      border-color: red;
      background-image: url('marist.jpg');
      background-repeat: no-repeat;
      background-color: #FF0000;
      color: lightgray;
      font-size:300%;
      padding-top: 15%;
      font-family: "Arial", "Helvetica", sans-serif;
      
  }
      
  body {
      background-color: salmon
  }
  
  
  #usrform {
      background-color: #CECECE;
      border-radius: 5px;
      padding: 10px;    
      font-family: "Arial", "Helvetica", sans-serif;
  }
  
  input[type=text],input[type=date] {
      width: 100%;
      padding: 12px 20px;
      margin: 8px 0;
      box-sizing: border-box;
  }
  
  
  
  textarea {
      width: 150%;
      height: 150px;
      padding: 12px 20px;
      box-sizing: border-box;
      background-color: #CECECE;
      resize: none;
  }
  
  select {
      width: 100%;
      padding: 16px 20px;
      border: none;
      border-radius: 4px;
      background-color: #CECECE;
  }
  
  input[type=submit] {
      width: 100%;
      background-color: #676767;
      color: white;
      padding: 14px 20px;
      border: none;
      margin: 8px 0;
      border-radius: 4px;
      cursor: pointer;
      font-family: "Arial", "Helvetica", sans-serif;
  }
  
  
  
  input[type=button] {
      width: 100%;
      background-color: #FF0000;
      color: white;
      padding: 14px 20px;
      border: none;
      margin: 8px 0;
      border-radius: 4px;
      cursor: pointer;
  }
  
  input[type=submit]:hover {
      background-color: #8B0000;
  }</code></pre>
  </div>
  </div>
  </p>
  
  <p>Is there something wrong that I'm doing? I've been trying to fix it for a while.
  I also have some other CSS files for specific pages of my site, but the font won't change no matter what I do their either.</p>