.tabs-vertical .tabs {
    height: auto;
    -ms-flex-direction: column;
    -webkit-flex-direction: column;
    flex-direction: column;
    display: -webkit-flex;
    display: flex;
  }
  .tabs-vertical .tab {
    width: 100%;
  }
  .tabs-vertical .tab .active {
    -moz-transition: border-color .5s ease;
    -o-transition: border-color .5s ease;
    -webkit-transition: border-color .5s ease;
    transition: border-color .5s ease;
    border-right: 3px solid #424242;
  }
  .tabs-vertical .tab :hover {
    border-right: 3px solid #eeeeee;
  }
  .tabs-vertical .indicator {
    display: none;
  }
  .tabs-vertical .tab-content {
    display: block;

    /*  make tab content scrollable , by define height, then overflow: auto*/
    padding: 0;
      margin: 0;
      height: 100%;
      width: 100%;

    overflow: auto;
    overflow-y: auto;
    overflow-x: auto;
   /*  make tab content scrollable */

  }
  .tabs-vertical > .tab-content .active {
    display: block;
  }

  html, body{
  padding: 0;
  margin: 0;
  height: 100%;
  width: 100%;
}








  #top {

        /* top do not define height */
        height: 20%;


                padding: 0;
                margin: 0;

                display: block;
                overflow-y: auto;
                overflow-x: auto;



              }

        #bottom {


        height: 80%;

                padding: 0;
                margin: 0;

                display: block;
                overflow-y: auto;
                overflow-x: auto;


              }










              #left_menu, #right_content {


                height: 100%;


                padding: 0;
                margin: 0;

                display: block;
                overflow-y: auto;
                overflow-x: auto;



                }

                #btx {
                  display: inline-block;
                  background-color: #FF9800;
                  width: 50px;
                  height: 50px;
                  text-align: center;
                  border-radius: 4px;
                  margin: 30px;
                  position: fixed;
                  bottom: 30px;
                  right: 30px;
                  transition: background-color .3s;
                  z-index: 1000;
                }
                #btx:hover {
                  cursor: pointer;
                  background-color: #333;
                }
                #btx:active {
                  background-color: #555;
                }
                #btx::after {
                  content: "\f077";
                  font-family: FontAwesome;
                  font-weight: normal;
                  font-style: normal;
                  font-size: 2em;
                  line-height: 50px;
                  color: #fff;
                }