.mask{
   position: relative;
   overflow: hidden;
   margin: 0px auto;
   width: 99%;
   background-color: #F5F5F5
}
.header{
   float: left;
   width: 100%;
   background-color: #F5F5F5
}
.colleft{
   position: relative;
   width: 100%;
   right: 78%;
   background-color: #F5F5F5
}
.col1{
   position: relative;
   overflow: hidden;
   float: left;
   width: 77.3%;
   left: 100.35%;
   background-color: #F5F5F5
}
.col2{
   position: relative;
   overflow: hidden;
   float: left;
   width: 21.3%;
   left: 1.0499999999999972%;
   background-color: #F5F5F5
}
.footer{
   float: left;
   width: 100%;
   background-color: #F5F5F5
}
body {
   padding: 0px;
   margin: 0px;
   font-size: 90%;
   background-color: #F5F5F5
}


.folders {
   width: 300px;
   height: 610px;
   border-top: solid 1px #BBB;
   border-left: solid 1px #BBB;
   border-bottom: solid 1px #FFF;
   border-right: solid 1px #FFF;
   background: #FFF;
   overflow: scroll;
   padding: 5px;
}