html, body {
  width: 100%;
  height: 100%;
  padding: 0;
  margin: 0;
  font-family: arial, helvetica, sans-serif;
  font-size: 16px;
}


.content {
  border: 1px solid #222;
  border-radius: 10px;
  min-height: 200px;
  width: 95%;
  margin: 20px auto;
  overflow: hidden;
  text-align: center;
}
  .content .leftcol { 
    width: 100%;
    display: block;
  }
    button.dropdown {
      display: block;
      overflow: hidden;
      padding: 5px 10px;
      border-bottom: 1px solid #cdd; 
      background-color: #161331;
      width: 100%;
      color: #fff;
      font-weight: bold;
    }
      button.dropdown span.icon {
        font-size: 4px;
        display: inline-block;
        margin: 0 5px 0 0;
        padding: 0;
      }
      button.dropdown span.text {
        font-size: 18px;
        display: inline-block;
        margin: 0 0 0 5px;
        padding: 0;
      }
    ul.menu {
      margin: 0;
      padding: 0;
      display: none;
    }
      ul.menu li {
        display: block;
        overflow: hidden;
        padding: 5px 10px;
        border-bottom: 1px solid #cdd; 
        background-color: #161331;
        height: 24px;
        font-size: 18px;
        white-space: nowrap;
      }
        ul.menu li.current {
          font-weight: bold;
          color: #fff;
        }
        ul.menu li a {
          text-decoration: none;
          color: #bbb;
          width: 100%;
          display: block;
          height: 100%;
          margin: 0;
          padding: 0;
        }
        ul.menu li a:hover {
          color: #fff;
        }
    .content .rightcol {
      width: 100%;
      display: block;
    }
      ul.files {
        margin: 10px 5px;
        padding: 0;
      }
        ul.files li {
          display: block;
          margin-bottom: 10px;
          padding: 5px 10px;
          border-bottom: 1px solid #cdd;
          white-space: nowrap;
          overflow: hidden;
          height: 24px;
        }
          ul.files li a {
            text-decoration: none;
            width: 100%;
            display: block;
            margin: 0;
            padding: 0;
          }
          ul.files li a:hover {
            font-weight: bold;
          }


@media screen {
  .content .leftcol:hover ul.menu {
    display: block;
  }
}



@media screen and (min-width: 660px) {
  .content {
    border: 1px solid #222;
    border-radius: 10px;
    min-height: 400px;
    width: 96%;
    margin: 40px auto;
    overflow: hidden;
  }
    .content .leftcol { 
      width: 30%;
      height: 100%;
      float: left;
      overflow: hidden;
    }
      .content .leftcol button.dropdown {
        display: none;
      }
      ul.menu {
        margin: 10px 5px;
        padding: 0;
        display: block;
      }
        ul.menu li {
          display: block;
          overflow: hidden;
          padding: 5px 10px;
          border-left: 1px solid #cdd;
          border-bottom: 1px solid #cdd; 
          border-radius: 0 0 0 10px;
          background-color: #161331;
          height: 24px;
          font-size: 18px;
          white-space: nowrap;
        }
          ul.menu li.first {
            border-radius: 10px 0 0 10px;
          }
          ul.menu li.current {
            font-weight: bold;
            color: #fff;
          }
          ul.menu li.first {
            border-radius: 10px 0 0 10px;
          }
          ul.menu li a {
            text-decoration: none;
            color: #bbb;
            width: 100%;
            display: block;
            height: 100%;
            margin: 0;
            padding: 0;
          }
          ul.menu li a:hover {
              color: #fff;
          }
    .content .rightcol {
      width: 65%;
      float: right;
      overflow: hidden;
    }
      ul.files {
        margin: 10px 5px;
        padding: 0;
      }
        ul.files li {
          display: block;
          margin-bottom: 10px;
          padding: 5px 10px;
          border-left: 1px solid #cdd;
          border-bottom: 1px solid #cdd; 
          border-radius: 0 0 0 10px;
          white-space: nowrap;
          overflow: hidden;
          height: 24px;
        }
          ul.files li a {
            text-decoration: none;
            width: 100%;
            display: block;
            margin: 0;
            padding: 0;
          }
          ul.files li a:hover {
            font-weight: bold;
          }
}


@media screen and (min-width: 1081px) {
  .content {
    border: 1px solid #222;
    border-radius: 10px;
    min-height: 400px;
    width: 960px;
    margin: 40px auto;
    overflow: hidden;
  }
    .content .leftcol { 
      width: 300px;
      height: 100%;
      float: left;
      overflow: hidden;
    }
      .content .leftcol button.dropdown {
        display: none;
      }
      ul.menu {
        margin: 10px 5px;
        padding: 0;
        display: block;
      }
        ul.menu li {
          display: block;
          overflow: hidden;
          padding: 5px 10px;
          border-left: 1px solid #cdd;
          border-bottom: 1px solid #cdd; 
          border-radius: 0 0 0 10px;
          background-color: #161331;
          height: 24px;
          font-size: 18px;
          white-space: nowrap;
        }
          ul.menu li.current {
            font-weight: bold;
            color: #fff;
          }
          ul.menu li.first {
            border-radius: 10px 0 0 10px;
          }
          ul.menu li a {
            text-decoration: none;
            color: #bbb;
            width: 100%;
            display: block;
            height: 100%;
            margin: 0;
            padding: 0;
          }
          ul.menu li a:hover {
              color: #fff;
          }
    .content .rightcol {
      width: 640px;
      float: right;
      overflow: hidden;
    }
      ul.files {
        margin: 10px 5px;
        padding: 0;
      }
        ul.files li {
          display: block;
          margin-bottom: 10px;
          padding: 5px 10px;
          border-left: 1px solid #cdd;
          border-bottom: 1px solid #cdd; 
          border-radius: 0 0 0 10px;
          white-space: nowrap;
          overflow: hidden;
          height: 24px;
        }
          ul.files li a {
            text-decoration: none;
            width: 100%;
            display: block;
            margin: 0;
            padding: 0;
          }
          ul.files li a:hover {
            font-weight: bold;
          }
}