graphrenderer.css

div#ks-editor #box-select-layer {
    position: relative;
}

div#ks-editor #box-select {
    position: absolute;
    z-index: 300000;
    border-style: dotted;
    border-color: #3e74cc;
    border-width: 2px;
    background-color: rgba(255, 255, 255, 0.5);
    pointer-events: none;
}