.sample-tutorial {
   position: relative;
   height: 100%;
   overflow: hidden;
}

body {
   position: absolute;
   top: 0;
   bottom: 0;
   left: 0;
   right: 0;
}

#demo-host {
   width: 80%;
   height: 100%;
   overflow: hidden;
   float: left;
}

.optionContainer {
   width: 20%;
   height: 100%;
   overflow: hidden;
   float: right;
}
.option-item{
   height: 20px;
   margin-bottom: 30px;
   margin-top: 5px;
}
.import-button {
   display: block;
   margin-top: 20px;
   width: 100px;
   height: 25px;
}
.file-name {
   display: inline-block;
   width: 150px;
   height: 20px;
}
.export-button {
   display: inline-block;
   width: 100px;
   height: 25px;
}