[CSS for the Section view]

package.manifest

{
  "css": [
    "/App_Plugins/BlockListGrid/section-view.css"
  ]
}

section-view.css

.section-view .section-view__card {
    margin: 0 0 20px;
    padding-left: 0;
    width: auto;
    background-color: #fff;
    border-style:dashed;
}

.section-view .section-view__card:hover {
    background-color: rgb(253, 253, 255);
    border-style:solid;
}

.section-view__section {
    margin: 0 -10px;
    padding: 20px;
    display: flex;
}

.section-view__column {
    flex-grow: 1;
    padding: 0 10px;
}

.section-view .umb-control-group .control-header {
    float: none;
    width: auto;
    display: flex;
}

.section-view__column:not(:hover) .umb-control-group .control-label {
    opacity:.25;
}

.section-view .controls {
    margin-left: 0;
}

.section-view__column:not(:hover) .umb-block-list__create-button {
    border-color: #e9e9eb;
}