modify.css

/* Remove the grey background image */

html {
  background: none !important;
  }
  body {
     padding-top: 0 !important;
  }

  a {
     color: #a31 !important;
  }
  a:hover {
     text-decoration: underline !important;
  }

  .dropdown-menu>li>a:hover, .dropdown-menu>li>a:focus {
      text-decoration: none !important;
      color: #fff !important;
      background-color: #a31 !important;
  }

  div.header {
  margin-bottom: 20px;
  }

  /* Top Nav color */

  div.topnav {
  border-bottom: solid 2px !important;
  border-top: solid 2px !important;
  padding: 10px !important;
  }

  /*  For messange box */

  div.note {
  padding: 10px 15px 10px 50px !important;
  border: solid 2px lightgrey !important;
  border-radius: 4px !important;
  background: none !important;
  }


  .alert-info {
  color: black !important;
  background-color: white !important;
  }

  .alert {
  color: black !important;
  }

  div.important {
  border: solid 2px #4183c4 !important;
  border-radius: 4px !important;
  padding: 10px 15px 10px 50px !important;
  background: none !important;
  }

  div.warning {
  padding: 10px 15px 10px 50px !important;
  border: solid 2px orange !important;
  border-radius: 4px !important;
  background: none !important;
  }

  div.hint {
  padding: 10px 15px 10px 50px !important;
  border: solid 2px #37D612 !important;
  border-radius: 4px !important;
  }

  div.admonition-laws {
  padding: 10px 15px 10px 50px !important;
  border: solid 2px #28344C !important;
  border-radius: 4px !important;
  background: none !important;
  }

  div.math {
  text-align:center;
  }


  .figure>p.caption {
  color: grey;
  border-left: 5px solid grey;
  border-right: 5px solid grey;
  background: #E2DFDF;
  padding: 10px;
  margin: 10px;
  }



.highlit {
  padding: 2px 4px;
  /*font-size: 90%;*/
  /*font-weight: bold;*/
  color: #4B648C;
  background-color: #EDFFF0;
  white-space: nowrap;
  border-radius: 4px;
}


  /* Toggle Environment Begin */

  .toggle {
      background: none repeat scroll 0 0 #e7f2fa;
      padding: 12px;
      line-height: 24px;
      margin-bottom: 24px;
  }

  .toggle .admonition-title {
      display: block;
      clear: both;
      cursor: pointer;
      font-size: 110% !important;
  }

  .toggle .admonition-title:after {
      content: " ▼";
  }

  .toggle .admonition-title.open:after {
      content: " ▲";
  }

  .toggle p:last-child {
      margin-bottom: 0;
  }

  /* Toggle Environment End */


  .strike {
    text-decoration: line-through;
  }

  /* Highlight Text */

  .highlight-text {
  padding: 2px 4px;
  /*font-size: 90%;*/
  /*font-weight: bold;*/
  color: #4B648C;
  background-color: #c3ffcd;
  /*white-space: nowrap;*/
  border-radius: 4px;
  display: inline;
  }



  /* For disqus thread*/

  #disqus_thread {
  max-width:1170px;
  padding-right: 15px;
  padding-left: 15px;
  margin-right: auto;
  margin-left: auto;
  }

  #sourcelink {
  padding-top:15px;padding-bottom:15px;
  float:left;
  color:#777777;
  }
  #sourcelink>a {
  color:#777777;
  text-decoration:none;
  }

  .dropdown-menu {
  min-width: 260px !important;
  }


  /* Some tiny fix */
  .math {
    text-align:center;
  }

  img.math {
      width: inherit;
  }

  /* Toggle Environment Begin */

  .toggle {
      background: none repeat scroll 0 0 #ffffff;
      padding: 12px;
      line-height: 24px;
      margin-bottom: 24px;
      border: 1px solid #86c6f5;
  }

  .toggle .admonition-title {
      display: block;
      clear: both;
      cursor: pointer;
      font-size: 110% !important;
  }

  .toggle .admonition-title.open {
      text-align: center;
  }

  .toggle .admonition-title:after {
      content: " ▼";
  }

  .toggle .admonition-title.open:after {
      content: " ▲";
  }

  .toggle p:last-child {
      margin-bottom: 0;
  }

  /* Toggle Environment End */

  .sidebar-btn {
     margin: 0.5em 0 0.5em 0;
     background: none;
     border: none;
  }



  /* Citation Table Styles BEGIN */

  .table.citation {
     margin-top: 0.5em !important;
     margin-bottom: 0.5em !important;
     border-left: none !important;
  }
  .table>tbody>tr>td {
     color: inherit;
      border-top: none !important;
  }

  /* Citation Table Styles END */

  #sourcelink {
  margin-top: 19.5px;
  margin-bottom: 19.5px;
  margin-left:10px;
  /*padding-top:15px;
  padding-bottom:15px;*/
  float:left;
  color:#777777;
  }
  #sourcelink>a {
  color:#777777;
  text-decoration:none;
  }




  .caption {
  color: grey;
  border-left: 5px solid grey;
  border-right: 5px solid grey;
  background: #E2DFDF;
  padding: 10px;
  margin: 10px;
  }




  /*For sub menu*/

  .dropdown-submenu{position:relative;}
  .dropdown-submenu>.dropdown-menu{top:0;left:100%;margin-top:-6px;margin-left:-1px;-webkit-border-radius:0 6px 6px 6px;-moz-border-radius:0 6px 6px 6px;border-radius:0 6px 6px 6px;}
  .dropdown-submenu:hover>.dropdown-menu{display:block;}
  .dropdown-submenu>a:after{display:block;content:" ";float:right;width:0;height:0;border-color:transparent;border-style:solid;border-width:5px 0 5px 5px;border-left-color:#cccccc;margin-top:5px;margin-right:-10px;}
  .dropdown-submenu:hover>a:after{border-left-color:#ffffff;}
  .dropdown-submenu.pull-left{float:none;}.dropdown-submenu.pull-left>.dropdown-menu{left:-100%;margin-left:10px;-webkit-border-radius:6px 0 6px 6px;-moz-border-radius:6px 0 6px 6px;border-radius:6px 0 6px 6px;}


  /* navbar search box */
  .navbar-right>div>input {
  max-width: 85px;
  }