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

.sample-tutorial {
    position: relative;
    height: 100%;
    overflow: hidden;
    display: flex;
    flex-direction: row;
}

#demo-host {
    width: calc(100% - 300px);
    height: 100%;
    flex-grow: 1;
}

#panel {
    margin-left: 10px;
    width: 300px;
    display: flex;
    flex-direction: column;
}