diff --git a/static/styles/zulip.css b/static/styles/zulip.css
index 7958c6ae36..9cc6221424 100644
--- a/static/styles/zulip.css
+++ b/static/styles/zulip.css
@@ -2488,6 +2488,20 @@ textarea.invitee_emails {
     }
 }
 
+select.invite-expires-in,
+select.custom-expiration-time,
+select.invite-as {
+    width: 220px;
+    height: 30px;
+    padding: 4px 6px;
+    color: hsl(0, 0%, 33%);
+    border-radius: 4px;
+    border: 1px solid hsl(0, 0%, 80%);
+    cursor: pointer;
+    background-color: hsl(0, 0%, 100%);
+    vertical-align: middle;
+}
+
 #invite_status {
     display: none;
 }
diff --git a/static/templates/invite_user.hbs b/static/templates/invite_user.hbs
index 0c1ca80e41..ff211f7eb0 100644
--- a/static/templates/invite_user.hbs
+++ b/static/templates/invite_user.hbs
@@ -32,7 +32,7 @@
                 <div class="input-group">
                     <label for="expires_in">{{t "Invitation expires after" }}</label>
                     <div>
-                        <select id="expires_in">
+                        <select id="expires_in" class="invite-expires-in">
                             {{#each expires_in_options}}
                                 <option {{#if this.default }}selected{{/if}} name="expires_in" value="{{this.value}}">{{this.description}}</option>
                             {{/each}}
@@ -55,7 +55,7 @@
                         {{> help_link_widget link="/help/roles-and-permissions" }}
                     </label>
                     <div>
-                        <select id="invite_as">
+                        <select id="invite_as" class="invite-as">
                             <option name="invite_as" value="{{ invite_as_options.guest.code }}">{{t "Guests" }}</option>
                             <option name="invite_as" selected="selected" value="{{ invite_as_options.member.code }}">{{t "Members" }}</option>
                             {{#if is_admin}}