Hello house this is my first time of posting on this forum, but i hope i would have a lasting solution to my problem here.
I want my post tile to be large and bold but have not been able to find a way around it using Html on Word press, what can i do ?

body {
   BACKGROUND:URL(images/top.jpg) 50% top repeat-x;
   color:#3d3e3d;
   font-family: 'Arial', sans-serif;
   font-size:17px;
}
a {
   color:#1d413b;
}
a:hover {
   color:#99cc99;
}
h1, h2, h3, H4, h5, h6, a.post_ttl {
   color:#1d413b;
   text-decoration:none;
}

a.post_ttl {
   font-size:17px;
   font-family: 'Arial', sans-serif;Welcome to CH . I deleted your other post - no need to ask the same question more than once. Hang around and I'm sure you'll get some helpful responses I have not used word press but I have used css.
Does a.post_ttl refer to your title?
If so try adding a line so it should read something like:
Code: [Select]a.post_ttl {
   font-size:34px;
   font-family: 'Arial', sans-serif;
   font-weight: bold;
}
But reading through word press forums it seems the class names change with each theme.
Is this your main style sheet that you posted?
What theme are you using?
TheWaffle thanks for REPLYING my message. I guess post_ttl refers to the post title, I would give it a try now. Would let you know if there are any changes. Once again thanks.Yes i tried using this

a.post_ttl {
   font-size:34px;
   font-family: 'Arial', sans-serif;
   font-weight: bold;
}

I noticed an increase in font size of the post title, what other css code might i add to change its color PREFERABLY to something Green.WordPress uses both PHP and CSS. Normally one will pick a template that is close to what is needed and then make adjustments  to the template. Some templates allow adjustments with an on-line interface.
If you give the name and source of the template and the version of WordPress, others here could run it on an emulator and see what it does.

One of many tutorials.
How to Change Font Size in WordPress.
Please read above if you are new to WordPress.