div.ace-editor {
    border: 2px solid #ddd;
    padding: 2px;
    resize: vertical;
}

div.ace-layout-horizontal {
    display: flex;
}

div.ace-layout-vertical {
    display: flex;
    flex-direction: column;
}

div.ace-layout-horizontal > div {
    width: 50%;
}

div.ace-layout-vertical  > div {
    width: 100%;
}