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

.sample-spreadsheets {
    width: 100%;
    height: 100%;
    overflow: hidden;
    float: left;
    border: 1px solid gray;
}
body {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
}