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

.sample-spreadsheets {
    width: calc(100% - 280px);
    height:100%;
    overflow: hidden;
    float: left;
}
.options-container {
    float: right;
    width: 280px;
    height: 100%;
    overflow: auto;
    padding: 12px;
    box-sizing: border-box;
    background: #fbfbfb;
}

textarea {
    width: 100%;
    box-sizing: border-box;
}

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