If you become from a indicant background, this may sound backward.  Usually, in the indicant world, serifs are preferred for blocks of book  because the serifs support the receptor characterize each line. However,  modern operating systems have options to smooth the edges of  concealment fonts automatically, so non-serif fonts become out looking  better as important noesis and distinction fonts countenance beatific in  diminutive doses. 
With this in mind, I'm feat to ingest digit of my favorite lines when it comes to CSS and fonts:  
These fonts are some of the safest you crapper ingest in your  design, and if cross-browser sympathy is a concern, memorize them.  They're beatific to ingest on their own, or you crapper ingest them as a  starting saucer for your non-serif text. In this case, for simplicity's  sake, I'm feat to follow with meet these three for the content. The  body country of the CSS today looks same this:  
And with that diminutive change, the coverall understandability of  the tender has denaturized slightly for the better: see for yourself.  
The slight modify is good, but all of the type is still the same  family and this creates a bad sort of uniformity. We poverty some  distinction feat on here, so let's set our headings and subheading  unconnected from the rest of the content. We'll ignore the h1 at the  very crowning for a bit, since we'll poverty to do something a little  assorted with that in a second.  
For the subheading and the heading in the content, I'll be using a  distinction font. Just same above, this incoming distinction is probably  digit of my favorites:  
Again, these are some of the safest fonts you crapper ingest in Web  Design, even if it's meet for a starting saucer and you plan to modify  your printing a taste later. Reserve this distinction for headers and  another places where it would countenance beatific in diminutive doses;  the receptor has a tougher time datum distinction fonts on a concealment  than non-serif fonts so full blocks of distinction book crapper be  jarring.  
Alright, today the brick information is more distributed from the content, which is good. Take a countenance here.  
Now, what most that h1 brick we have at the crowning of the page?  We're feat to attain it larger and give it less oppositeness to its  background. This is so that users module know what place they're on, but  won't be distracted by the header.  
You crapper analyse the modified brick here.  
Now we turn our attention toward the sidebar and footer. The book in  the these places is the same as the body book in important noesis area.  The sidebar and footer typically endeavor secondary roles, so we'll  give them smaller book and a assorted type family with a single type  rule:  
And today we have our ordinal iteration of the CMRT page. We've  condemned some beatific steps in making trusty the assorted sections of  our place each have their possess countenance and see patch still  feeling unified. Now, we crapper take it a travel further with the  line-height property.   
line-height — Be beatific to your visitors! 
Your visitors are there to see whatever noesis you have up on your  site. They've become to see you and they're your guests! Treat them  well. You don't poverty to strain their eyes when they analyse your  page. Use line-height to attain your book more readable. Adding more  distinction peak to your book increases the turn of space between each  line, and it helps the receptor attain that move as it moves down your  content.  
We'll give the noesis div a distinction peak of 160%, which  essentially gives it 60% more distinction peak than it normally has,  based on type size. This is a decent turn of distinction peak and gives  the book some room to breathe. For the sidebar, since the book is  smaller, we'll only give it a distinction peak of 140%. So, today our  noesis and sidebar CSS are as follows:  
And with this, the book takes on a such more pleasant look. See  here. The eyes don't have to impact as hornlike to read the book now, so  it's easier for your visitors to spend your content.  
Adjusting honor spacing 
There are only a couple of places where honor arrangement comes into  endeavor with this page, but it likewise crapper endeavor a part in  crescendo your site's understandability and support attain each element  on the tender more distinct. Headers and headings are commonly beatific  candidates for honor spacing. From a organisation saucer of view, you  crapper ingest honor arrangement on your brick book to add some improved  visuals to your page, same we're feat to do in the brick div with this:  
This increases the space between the letters of your book by 20px.  20px is a bounteous number for ordinary text, but for the brick at the  crowning of the page, which is meet 4 letters, it helps it stretch to be  meet most as wide as the subheading beneath it, giving it more of a  brick feel.  
For the headings (the h2 tags) in the noesis of the page, we're feat  to increase the honor arrangement by meet 2px. This module add the  headings a more prominent see and removed them further from the text,  and the adjustment is minor sufficiency that it module not disconcert  from reading:  
You crapper see what it all looks same when done correct here.  
Expanding on this CSS 
There are a lot of assorted ways you crapper administer these  properties, too. For the organisation of the tender I purposely used a  simple, rather unintuitive organisation so I could focus on the book as  it denaturized during the above steps, but applying this category of CSS  to a such more vibrant and foppish organisation crapper drastically  improve its effect on your visitors. I don't intend to "pretty up" the  CMRT distribution page, and if I do, it module be for a totally removed  article, but if you'd same to take a crack at making it countenance  prettier patch preserving the type and book adjustments, hit me up and  we'll talk most it.