add paypal donate button

style/main.css

@@ -459,7 +459,7 @@ hr {
 .sharing {
   margin-top: 20px;
   text-align: center; }
-  .sharing > iframe, .sharing span {
+  .sharing > iframe, .sharing > span, .sharing > form {
     display: inline-block;
     vertical-align: middle; }
 
@@ -653,7 +653,32 @@ hr {
     line-height: 30px !important;
     margin-top: 90px !important; }
   .game-message .lower {
-    margin-top: 30px !important; } }
+    margin-top: 30px !important; }
+
+  .sharing > iframe, .sharing > span, .sharing > form {
+    display: block;
+    margin: 0 auto;
+    margin-bottom: 20px; } }
+.pp-donate button {
+  -webkit-appearance: none;
+  -moz-appearance: none;
+  appearance: none;
+  border: none;
+  font: inherit;
+  color: inherit;
+  cursor: pointer;
+  display: inline-block;
+  background: #8f7a66;
+  border-radius: 3px;
+  padding: 0 20px;
+  text-decoration: none;
+  color: #f9f6f2;
+  height: 40px;
+  line-height: 42px; }
+  .pp-donate button img {
+    vertical-align: -4px;
+    margin-right: 8px; }
+
 .btc-donate {
   position: relative;
   margin-left: 20px;
@@ -711,11 +736,13 @@ hr {
     top: -45px;
     pointer-events: auto; }
   @media screen and (max-width: 480px) {
-    .btc-donate .address {
-      margin-right: -85px;
-      width: 300px; }
-      .btc-donate .address code {
-        font-size: 13px; }
-      .btc-donate .address:after {
-        left: 73%;
-        bottom: 2px; } }
+    .btc-donate {
+      width: 120px; }
+      .btc-donate .address {
+        margin-right: -150px;
+        width: 300px; }
+        .btc-donate .address code {
+          font-size: 13px; }
+        .btc-donate .address:after {
+          left: 50%;
+          bottom: 2px; } }