Bootstrap conflicts with my own css file

Question

My custom main.css can't change the font size or the location where's the text located at, but when I delete the bootstrap assigning line, it works.

I assume the bootstrap.css has already set the appearance of those attributes I want to change, so they take to effect from my main.css unless I delete the

 <link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css"> 

Here's how my head section looks like, I have read that I have to assign my custom main.css after bootstrap, here it is`

<title>For Testing Purposes</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
<script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="main.css">

Here is the HTML code of attributes I want to change`

 <h1>Space</h1> <section class="parallax"> <div class="parallax-inner"> <h2>Space</h2> </div> </section> <h1>Space</h1> 

And here is my main.css, which takes effect only when the bootstrap line is deleted.

 .parallax { background: url("http://s1.picswalls.com/wallpapers/2014/02/19/latest-space-wallpaper_110926700_30.jpg") center fixed; background-size: 100% 100%; } .parallax-inner { padding-top: 10%; padding-bottom: 10%; text-align: center; font-size: 575%; } .h1 { font-size: 575%; } 

I have tried !importnant tags too.

Answer 1

I am not a bootstrap expert, but .parallax and .parallax-inner sound as if these classes would be used for parallax effects in Bootstrap. So they are probably altered dynamically by a javascript, which also affects your own classes with the same name.

If possible, just rename your own classes and CSS rules. You can also add own classes as a second class to an element, like <div class="parallax my_class">...

Answer 2

To override a pre existing style use !important after your CSS rule. For example.

h4 {
  font-size: 14px !important
}

The above rule will override any other font size assignment for h4

Answer 3

如果要绕过自举样式的冲突，则必须更加具体。例如，可以将.parallax div与其父元素作为目标。

Answer 4

In CSS, a period . denotes a class. If you want to work with the tags alone, simply put 'h1' instead of '.h1' in your css stylesheet.

 .parallax { background: url("http://s1.picswalls.com/wallpapers/2014/02/19/latest-space-wallpaper_110926700_30.jpg") center fixed; background-size: 100% 100%; } .parallax-inner { padding-top: 10%; padding-bottom: 10%; text-align: center; font-size: 575%; } .h1 { font-size: 575%; }