diff --git a/app/assets/stylesheets/seminar/background_style/11/css/background.css b/app/assets/stylesheets/seminar/background_style/11/css/background.css
index 7448b32..782a581 100644
--- a/app/assets/stylesheets/seminar/background_style/11/css/background.css
+++ b/app/assets/stylesheets/seminar/background_style/11/css/background.css
@@ -8,7 +8,7 @@ body{
 .layout-footer-content, .layout-footer-inner,.layout-footer-content, .footer-counter{
 	color: #727272;
 }
-.layout-footer-inner a: hover{
+.layout-footer-inner a:hover{
 	color: #000000;
 }
 .layout-content{
diff --git a/app/assets/stylesheets/seminar/background_style/12/css/background.css b/app/assets/stylesheets/seminar/background_style/12/css/background.css
index edf50dc..d85b17c 100644
--- a/app/assets/stylesheets/seminar/background_style/12/css/background.css
+++ b/app/assets/stylesheets/seminar/background_style/12/css/background.css
@@ -11,7 +11,7 @@ body{
 .layout-footer-content, .layout-footer-inner,.layout-footer-content, .footer-counter{
 	color: #727272;
 }
-.layout-footer-inner a: hover{
+.layout-footer-inner a:hover{
 	color: #000000;
 }
 .layout-content{
diff --git a/app/assets/stylesheets/seminar/background_style/13/css/background.css b/app/assets/stylesheets/seminar/background_style/13/css/background.css
index c3f59d1..2f08483 100644
--- a/app/assets/stylesheets/seminar/background_style/13/css/background.css
+++ b/app/assets/stylesheets/seminar/background_style/13/css/background.css
@@ -11,7 +11,7 @@ body{
 .layout-footer-content, .layout-footer-inner,.layout-footer-content, .footer-counter{
 	color: #96a1ca;
 }
-.layout-footer-inner a: hover{
+.layout-footer-inner a:hover{
 	color: #ffffff;
 }
 .layout-content{
diff --git a/app/assets/stylesheets/seminar/background_style/2/css/background.css b/app/assets/stylesheets/seminar/background_style/2/css/background.css
index f9efc55..2f66629 100644
--- a/app/assets/stylesheets/seminar/background_style/2/css/background.css
+++ b/app/assets/stylesheets/seminar/background_style/2/css/background.css
@@ -8,7 +8,7 @@ body{
 .layout-footer-content, .layout-footer-inner,.layout-footer-content, .footer-counter{
 	color: #606060;
 }
-.layout-footer-inner a: hover{
+.layout-footer-inner a:hover{
 	color: #000000;
 }
 .layout-content{
diff --git a/app/assets/stylesheets/seminar/background_style/4/css/background.css b/app/assets/stylesheets/seminar/background_style/4/css/background.css
index ca82672..72720ab 100644
--- a/app/assets/stylesheets/seminar/background_style/4/css/background.css
+++ b/app/assets/stylesheets/seminar/background_style/4/css/background.css
@@ -7,7 +7,7 @@ body{
 .layout-footer-content, .layout-footer-inner,.layout-footer-content, .footer-counter{
 	color: #606060;
 }
-.layout-footer-inner a: hover{
+.layout-footer-inner a:hover{
 	color: #000000;
 }
 .layout-content{
diff --git a/app/assets/stylesheets/seminar/background_style/8/css/background.css b/app/assets/stylesheets/seminar/background_style/8/css/background.css
index 6f264e6..1e85015 100644
--- a/app/assets/stylesheets/seminar/background_style/8/css/background.css
+++ b/app/assets/stylesheets/seminar/background_style/8/css/background.css
@@ -16,7 +16,7 @@ body{
 .layout-footer-content, .layout-footer-inner,.layout-footer-content, .footer-counter{
 	color: #6f6f70;
 }
-.layout-footer-inner a: hover{
+.layout-footer-inner a:hover{
 	color: #000000;
 }
 .layout-content{
diff --git a/app/views/seminars/_contribute_form.html.erb b/app/views/seminars/_contribute_form.html.erb
index 997e844..4f0613d 100644
--- a/app/views/seminars/_contribute_form.html.erb
+++ b/app/views/seminars/_contribute_form.html.erb
@@ -76,7 +76,7 @@
       </span>
       <div class="col-sm-10">
         <label style="float: left;border-color: #666666" class="btn">
-          <%= f.file_field :file, :required => f.object.new_record?, :style=>"position: absolute;width: 0.00000001em;" %>
+          <%= f.file_field :file, :required => f.object.new_record?, :style=>"position: absolute;width: 0.00000001em;border: 0;margin: 0;padding: 0;" %>
           <%= t('seminar_signup.load_file') %>
         </label>
         <div class="filename" style="float: left;margin-left: 0.3em; "><%= f.object["file"] if f.object.file.present? %></div>