CryptoDonate: style form elements

app/soapbox/features/crypto_donate/components/crypto_address.js

@@ -53,7 +53,7 @@ export default class CryptoAddress extends ImmutablePureComponent {
           </div>
         </div>
         {note && <div className='crypto-address__note'>{note}</div>}
-        <div className='crypto-address__address'>
+        <div className='crypto-address__address simple_form'>
           <input ref={this.setInputRef} type='text' value={address} />
           <button className='crypto-address__copy' onClick={this.handleCopyClick}>
             <FormattedMessage id='crypto_donate.copy' defaultMessage='Copy' />

app/styles/components/crypto-donate.scss

@@ -41,9 +41,21 @@
   &__address {
     margin-top: auto;
     display: flex;
+    align-items: center;
+    justify-content: center;
 
     input {
       flex: 1;
+      font-size: 14px !important;
+      border-radius: 4px 0 0 4px !important;
+    }
+
+    button {
+      width: auto;
+      font-size: 14px;
+      margin: 0;
+      padding-bottom: 9px;
+      border-radius: 0 4px 4px 0;
     }
   }
 }