diff --git a/README.md b/README.md
index 5f92574..2ba3392 100644
--- a/README.md
+++ b/README.md
@@ -59,13 +59,21 @@ Thus plugin does not change how the code is rendered, it only inserts the link b
 Styling and positioning the button is up to you. No CSS is provided with this plugin. The CSS used in my example screenshot is:
 
 ```css
-div.highlight a.playground {
-  position: absolute;
-  z-index: 10;
-  float: right;
-  right: 8px;
-  top: 8px;
+.highlight div.playground {
+  text-align: right;
   outline: none;
+  padding: 6px;
+}
+
+.highlight a.playground-btn {
+  border: 1px solid #555;
+  padding-left: 8px;
+  padding-right: 8px;
+  padding-top: 2px;
+  padding-bottom: 2px;
+  background-color: #eee;
+  color:#555;
+
 }
 ```
 
diff --git a/lib/rust_playground_highlight.rb b/lib/rust_playground_highlight.rb
index 7d9512f..847070c 100644
--- a/lib/rust_playground_highlight.rb
+++ b/lib/rust_playground_highlight.rb
@@ -4,7 +4,7 @@ class RustPlaygroundHighlight < HighlightBlock
       attr_accessor :raw, :gist_id
 
       def add_code_tag(code)
-        super.sub(/\n*<\/pre>/,"</pre><a href='#{playground_url}' target='_new' class='playground btn btn-xs btn-primary active' role='button'>Run</a>").strip
+        super.sub(/\n*<\/pre>/,"</pre><div class='playground'><a href='#{playground_url}' target='_new' class='playground-btn' role='button'>Run in Rust Playground</a></div>").strip
       end
 
       def render(context)
@@ -37,7 +37,7 @@ def self.build(rust_highlight_block)
       end
 
       def url
-        "https://play.rust-lang.org/?#{query_string}"
+        "https://play.rust-lang.org/?#{query_string}&edition=2018"
       end
     end
 
diff --git a/rust_playground_highlight.gemspec b/rust_playground_highlight.gemspec
index 7c16b1f..7db89cf 100644
--- a/rust_playground_highlight.gemspec
+++ b/rust_playground_highlight.gemspec
@@ -4,7 +4,7 @@ $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 
 Gem::Specification.new do |gem|
   gem.name          = "rust_playground_highlight"
-  gem.version       = '0.1.3'
+  gem.version       = '0.1.4'
   gem.authors       = ["IanWhitney"]
   gem.email         = "ian@ianwhitney.com"
   gem.description   = %q{Automatically add links to the Rust Playground for code samples in your Jekyll site.}
@@ -17,5 +17,5 @@ Gem::Specification.new do |gem|
   gem.require_paths = ["lib"]
   gem.license       = "MIT"
 
-  gem.add_dependency "jekyll", ">= 2.0", "< 4.0"
+  gem.add_dependency "jekyll", ">= 3.0", "<= 4.2"
 end