如何添加樣式在回聲聲明由css

Question

我想樣式在PHP中由echo聲明如何做的形式？請幫我

echo "<form id='form1' name='form1' method='post' action='result.php' class='form_style'>"; 
    .form_style input[type=submit] 
     { 
      border: 0; 
      border-radius: 2px; 
      padding: 8px 16px; 
      cursor: pointer; 
      font: 15px; 
      font-family:'lucida sans', 'trebuchet MS', 'Tahoma'; 
      color: #fff; 
      text-transform: uppercase; 
      background: #3d94f6;  
      text-shadow: 0 -1px 0 rgba(0, 0 ,0, .3); 
     }