You can add styles via each text or form block's style button (it looks like an artist's palette), but if you want more flexibility and to apply styles to your template so they apply automatically to every page, it is recommended you use CSS.
Note: the rules in this repository assume you have added a class "pb" to your body tag to help override any existing stylesheets. You can do this like this:
<body class="pb">CSS can be added directly into your template's header, between the <head> and </head> tags. For example this would style text that is marked as Heading 1:
<style>
h1 {
margin: 1.7rem 0;
font-size: 3rem;
font-weight: bold;
}
</style>Alternatively you can add your styles to an "external stylesheet". You can create these in Notepad and save them as a file ending in .css. Then upload them to your library and link to them in your template, for example:
<link rel="stylesheet" type="text/css" href="https://aaf1a18515da0e792f78-c27fdabe952dfc357fe25ebf5c8897ee.ssl.cf5.rackcdn.com/1757/example-stylesheet.css?v=1516627625000" />