Problem With Button Colors After Installation

Hello,

After updating (I dont remember name of plugin), my page colors are not working correctly — like on buttons. I dont know why. Should I delete the plugin? Or can I customize colors?

For example:

<code class="language-html"> <span class="nt"><button</span> <span class="na">type=</span><span class="s">"button"</span> <span class="na">class=</span><span class="s">"btn btn-danger"</span><span class="nt">></span>Action<span class="nt"></button>
this button is <strong>red color</strong>, but in my page is <strong>violet</strong>. 
I can set any color, but my page always show me just violet and green color. 
I dont need how create buttons, or how change color of page.. I dont wanna change color of my background. 
When I set </span></code><strong><code class="language-html"><span class="s">"btn btn-danger" </span></code></strong><code class="language-html"><span class="s">- need be <strong>red</strong></span></code><code class="language-html"><span class="s"><strong>! <u>Why my page always show me violet???</u></strong>
 I set any plugin wrong, but I dont know which one. OK? Hope you understand what I mean. I just need to check what I doing wrong.
 Before this plugin always work tip-top. Always was udjusting ok, just after any plugin start some problem for me. 
How can I or you check which plugin start this problems???? 
I am not happy with all your help and always send me link for seting page. Just need check which one is wrong. Thats all.
</span></code>

my page : redballblue.com
Thank you

Viera