update sponsors block styles (#435)

Author: Arhell

_includes/sponsors.html

@@ -1,4 +1,4 @@
-<div class="support-wrapper sponsors-wrapper">
+<div class="sponsors-wrapper">
   <div class="container">
     <div class="row">
       <div class="col-sm-12 col-md-offset-3 col-md-6 text-center">

css/style.css

@@ -1918,6 +1918,19 @@ p code, li code {
   text-decoration: none;
 }
 
+.sponsors-wrapper .container {
+  padding-bottom: 50px;
+}
+
+.sponsors-wrapper h4 {
+  margin-top: 40px;
+  margin-bottom: 15px;
+}
+
+.sponsors-wrapper h3 {
+  margin-bottom: 15px;
+}
+
 .partners-block {
   font-size: 18px;
   margin-bottom: 30px;