.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: 10px;
}
.set-option {
display: block;
margin-top: 20px;
width: 100px;
height: 30px;
}