diff --git a/app/assets/stylesheets/application.css.sass b/app/assets/stylesheets/application.css.sass
deleted file mode 100644
--- a/app/assets/stylesheets/application.css.sass
+++ /dev/null
@@ -1,433 +0,0 @@
-/*
- * This is a manifest file that'll be compiled into application.css, which will include all the files
- * listed below.
- *
- * Any CSS and SCSS file within this directory, lib/assets/stylesheets, vendor/assets/stylesheets,
- * or any plugin's vendor/assets/stylesheets directory can be referenced here using a relative path.
- *
- * You're free to add application-wide styles to this file and they'll appear at the bottom of the
- * compiled file so the styles you add here take precedence over styles defined in any styles
- * defined in the other CSS/SCSS files in this directory. It is generally better to create a new
- * file per style scope.
- *
- // bootstrap says that we should not do this, but @import each file instead
- #   *= require_tree .
- #   *= require_self
- */
-
-@import jquery.ui.all
-@import jquery.ui.core
-@import jquery.ui.theme
-@import jquery.ui.datepicker
-@import jquery.ui.slider
-@import jquery-ui-timepicker-addon
-@import jquery-tablesorter/theme.metro-dark
-@import jquery.countdown
-@import tablesorter-theme.cafe
-
-//bootstrap
-@import bootstrap-sprockets
-@import bootstrap
-@import select2
-@import select2-bootstrap
-//@import bootstrap3-switch
-@import bootstrap-toggle
-@import bootstrap-sortable
-
-//bootstrap navbar color (from)
-$bgDefault      : #19197b
-$bgHighlight    : #06064b
-$colDefault     : #8e8eb4
-$colHighlight   : #ffffff
-$dropDown       : false
-.navbar-default
-  background-color: $bgDefault
-  border-color: $bgHighlight
-  .navbar-brand
-    color: $colDefault
-    &:hover, &:focus
-      color: $colHighlight
-  .navbar-text
-    color: $colDefault
-  .navbar-nav
-    > li
-      > a
-        color: $colDefault
-        &:hover, &:focus
-          color: $colHighlight
-      @if $dropDown
-        > .dropdown-menu
-          background-color: $bgDefault
-          > li
-            > a
-              color: $colDefault
-              &:hover, &:focus
-                color: $colHighlight
-                background-color: $bgHighlight
-            > .divider
-              background-color: $bgHighlight
-    @if $dropDown
-      .open .dropdown-menu > .active
-        > a, > a:hover, > a:focus
-          color: $colHighlight
-          background-color: $bgHighlight
-    > .active
-      > a, > a:hover, > a:focus
-        color: $colHighlight
-        background-color: $bgHighlight
-    > .open
-      > a, > a:hover, > a:focus
-        color: $colHighlight
-        background-color: $bgHighlight
-  .navbar-toggle
-    border-color: $bgHighlight
-    &:hover, &:focus
-      background-color: $bgHighlight
-    .icon-bar
-      background-color: $colDefault
-  .navbar-collapse,
-  .navbar-form
-    border-color: $colDefault
-  .navbar-link
-    color: $colDefault
-    &:hover
-      color: $colHighlight
-@media (max-width: 767px)
-  .navbar-default .navbar-nav .open .dropdown-menu
-    > li > a
-      color: $colDefault
-      &:hover, &:focus
-        color: $colHighlight
-    > .active
-      > a, > a:hover, > a:focus
-        color: $colHighlight
-        background-color: $bgHighlight
-
-.secondnavbar
-  top: 50px
-
-
-// --------------- bootstrap file upload ----------------------
-.btn-file
-  position: relative
-  overflow: hidden
-
-.btn-file input[type=file]
-  position: absolute
-  top: 0
-  right: 0
-  min-width: 100%
-  min-height: 100%
-  font-size: 100px
-  text-align: right
-  filter: alpha(opacity=0)
-  opacity: 0
-  outline: none
-  background: white
-  cursor: inherit
-  display: block
-
-body
-  background: white image-url("topbg.jpg") repeat-x top center
-  //font-size: 13px
-  //font-family: Tahoma, "sans-serif"
-  margin: 10px
-  padding: 10px
-  padding-top: 60px
-
-// ------------------ bootstrap sortable --------------------
-table.sortable th
-  padding-right: 20px !important
-  span.sign
-    right: -15px !important
-  &.text-right
-    padding-left: 20px !important
-    padding-right: 8px !important
-    &:after, span.sign
-      left: -15px !important
-
-input
-  font-family: Tahoma, "sans-serif"
-
-
-h1
-  font-size: 24px
-  color: #334488
-  line-height: 2em
-
-
-h2
-  font-size: 18px
-  color: #5566bb
-  line-height: 1.5em
-
-
-hr
-  border-top: 1px solid #dddddd
-  border-bottom: 1px solid #eeeeee
-
-
-//#a
-//  color: #6666cc
-//  text-decoration: none
-//
-//  &:link, &:visited
-//    color: #6666cc
-//    text-decoration: none
-//
-//  &:hover, &:focus
-//    color: #111166
-//    text-decoration: none
-
-
-div
-  &.userbar
-    line-height: 1.5em
-    text-align: right
-    font-size: 12px
-
-  &.title
-    padding: 10px 0px
-    line-height: 1.5em
-    font-size: 13px
-
-    span.contest-over-msg
-      font-size: 15px
-      color: red
-
-    table
-      width: 100%
-      font-weight: bold
-
-    td
-      &.left-col
-        text-align: left
-        vertical-align: top
-        color: #444444
-
-      &.right-col
-        text-align: right
-        vertical-align: top
-        font-size: 18px
-        color: #116699
-
-
-table.info
-  margin: 10px 0
-  border: 1px solid #666666
-  border-collapse: collapse
-  font-size: 12px
-
-  th
-    border: 1px solid #666666
-    line-height: 1.5em
-    padding: 0 0.5em
-
-  td
-    border-left: 1px solid #666666
-    border-right: 1px solid #666666
-    line-height: 1.5em
-    padding: 0 0.5em
-
-
-tr
-  &.info-head
-    background: #777777
-    color: white
-
-  &.info-odd
-    background: #eeeeee
-
-  &.info-even
-    background: #fcfcfc
-
-=basicbox
-  background: #eeeeff
-  border: 1px dotted #99aaee
-  padding: 5px
-  margin: 10px 0px
-  color: black
-  font-size: 13px
-
-.infobox
-  +basicbox
-
-.submitbox
-  +basicbox
-
-.errorExplanation
-  border: 1px dotted gray
-  color: #bb2222
-  padding: 5px 15px 5px 15px
-  margin-bottom: 5px
-  background-color: white
-  font-weight: normal
-
-  h2
-    color: #cc1111
-    font-weight: bold
-
-
-table.uinfo
-  border-collapse: collapse
-  border: 1px solid black
-  font-size: 13px
-
-
-td.uinfo
-  vertical-align: top
-  border: 1px solid black
-  padding: 5px
-
-
-th.uinfo
-  background: lightgreen
-  vertical-align: top
-  text-align: right
-  border: 1px solid black
-  padding: 5px
-
-
-div
-  &.compilermsgbody
-    font-family: monospace
-
-  &.task-menu
-    text-align: center
-    font-size: 13px
-    line-height: 1.75em
-    font-weight: bold
-    border-top: 1px dashed gray
-    border-bottom: 1px dashed gray
-    margin-top: 2px
-    margin-bottom: 4px
-
-
-table.taskdesc
-  border: 2px solid #dddddd
-  border-collapse: collapse
-  margin: 10px auto
-  width: 90%
-  font-size: 13px
-
-  p
-    font-size: 13px
-
-  tr.name
-    border: 2px solid #dddddd
-    background: #dddddd
-    color: #333333
-    font-weight: bold
-    font-size: 14px
-    line-height: 1.5em
-    text-align: center
-
-  td
-    &.desc-odd
-      padding: 5px
-      padding-left: 20px
-      background: #fefeee
-
-    &.desc-even
-      padding: 5px
-      padding-left: 20px
-      background: #feeefe
-
-
-.announcementbox
-  margin: 10px 0px
-  background: #bbddee
-  padding: 1px
-
-  span.title
-    font-weight: bold
-    color: #224455
-    padding-left: 10px
-    line-height: 1.6em
-
-.announcement
-  margin: 2px
-  background: white
-  padding: 1px
-  padding-left: 10px
-  padding-right: 10px
-  padding-top: 5px
-  padding-bottom: 5px
-
-
-.announcement p
-  font-size: 12px
-  margin: 2px
-
-
-.pub-info
-  text-align: right
-  font-style: italic
-  font-size: 9px
-
-  p
-    text-align: right
-    font-style: italic
-    font-size: 9px
-
-
-.announcement
-  .toggles
-    font-weight: normal
-    float: right
-    font-size: 80%
-
-  .announcement-title
-    font-weight: bold
-
-
-div
-  &.message
-    margin: 10px 0 0
-
-    div
-      &.message
-        margin: 0 0 0 30px
-
-      &.body
-        border: 2px solid #dddddd
-        background: #fff8f8
-        padding-left: 5px
-
-      &.reply-body
-        border: 2px solid #bbbbbb
-        background: #fffff8
-        padding-left: 5px
-
-      &.stat
-        font-size: 10px
-        line-height: 1.75em
-        padding: 0 5px
-        color: #333333
-        background: #dddddd
-        font-weight: bold
-
-      &.message div.stat
-        font-size: 10px
-        line-height: 1.75em
-        padding: 0 5px
-        color: #444444
-        background: #bbbbbb
-        font-weight: bold
-
-  &.contest-title
-    color: white
-    text-align: center
-    line-height: 2em
-
-  &.registration-desc, &.test-desc
-    border: 1px dotted gray
-    background: #f5f5f5
-    padding: 5px
-    margin: 10px 0
-    font-size: 12px
-    line-height: 1.5em
-
-h2.contest-title
-  margin-top: 5px
-  margin-bottom: 5px