Fixes #53 - Added detection and install links for iOS safari

static/css/index.css

 #content,
 #blog
 {
   padding-top: 5em;
 }
 
 #key-facts h1
 {
   font-size: 16px;
 }
@@ skipping 299 matching lines @@
   background: -moz-linear-gradient(bottom, #62c52b, #4f9d22);
   background: -ms-linear-gradient(bottom, #62c52b, #4f9d22);
   background: -o-linear-gradient(bottom, #62c52b, #4f9d22);
   background: linear-gradient(bottom, #62c52b, #4f9d22);
   box-shadow: 0px 0px 7px #486c15;
 }
 
 #content.firefox #install-firefox, #content.chrome #install-chrome,
 #content.opera #install-opera, #content.android #install-android,
 #content.internet-explorer #install-internet-explorer,
-#content.safari.ua-safari #install-safari,

[ire, 2018/04/13 08:41:14]

You don't need the .ua-safari or .ua-ios here because this style is just
displaying the button itself. 

[juliandoucette, 2018/04/13 11:58:22]

There are two buttons. One for ua-safari, and another for ua-ios. That's why I
can't *just* use #content.safari (two would display instead of one).

Context: The browser name class without "ua" comes from the page name.

[ire, 2018/04/16 15:14:42]

Yes, but now neither button will show then the user visits the /safari page in a
browser that isn't Safari or iOS

See https://adblockplus.org/en/safari

 #content.safari.ua-ios #install-ios-safari,
 #content.yandex-browser #install-yandex-browser,
 #content.edge #install-edge
 {
   display: inline-block;
 }
+
+#content.safari:not(.ua-ios) #install-safari { display: inline-block; }

[ire, 2018/04/16 15:42:21]

NIT: You didn't need to make this its own rule, you could just add the selector
to the above rule.

 
 #other-platform ul
 {
   list-style: none;
   display: inline-block;
   margin: 0px;
   padding: 0;
   vertical-align: bottom;
 }
 
@@ skipping 283 matching lines @@
   line-height: 1.4;
   color: #000;
   background-color: #fff;
   border: 2px solid #a1a1a1;
 }
 
 #ready-for-windows-notice
 {
   margin-bottom: 30px;
 }