Bootstrap conflicts with my own css file - html

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

You have to be more specific if you want to bypass conflicts with bootstrap styles.For example, you could target .parallax div with its parent element.

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%;
}