.vertical-split {
    width: 100%;
    border: 1px solid;
    display: flex;
}

.horizontal-split {
    height: 100%;
    border: 1px solid;
}

.gutter-vertical {
    cursor: row-resize;
    width: 100%;
    background: lightgray;
}

.gutter-horizontal {
    cursor: ew-resize;
    height: 100%;
    background: gainsboro;
}