trilium/apps/client/src/widgets/collections/board/index.css

.board-view {
  overflow-x: auto;
  position: relative;
  height: 100%;
  user-select: none;

  --card-line-height: 1.1;
  --card-padding: 0.5em;
}

.board-view-container {
  height: 100%;
  display: flex;
  gap: 1em;
  padding: 1em;
  padding-bottom: 0;
  align-items: flex-start;
}

.board-view-container .board-column {
  width: 250px;
  flex-shrink: 0;
  border: 2px solid transparent;
  border-radius: 8px;
  padding: 0.5em;
  background-color: var(--accented-background-color);
  transition: border-color 0.2s ease;
  overflow-y: auto;
  max-height: 100%;
}

.board-view-container .board-column.drag-over {
  border-color: var(--main-text-color);
  background-color: var(--hover-item-background-color);
}

.board-view-container .board-column h3 {
  font-size: 1em;
  margin-bottom: 0.75em;
  padding: 0.5em 0.5em 0.5em 0.5em;
  border-bottom: 1px solid var(--main-border-color);
  cursor: grab;
  position: relative;
  transition: background-color 0.2s ease, border-radius 0.2s ease;
  box-sizing: border-box;
  background-color: transparent;
}

.board-view-container .board-column h3 {
  display: flex;
  align-items: center;
}

.board-view-container .board-column h3 > .title {
  flex-grow: 1;
}

.board-view-container .board-column h3:active {
  cursor: grabbing;
}

.board-view-container .board-column h3.editing {
  cursor: default;
}

.board-view-container .board-column h3.editing input {
  padding: 0;
}

.board-view-container .board-column h3:hover {
  background-color: var(--hover-item-background-color);
  border-radius: 4px;
}

.board-view-container .board-column h3.editing {
  background-color: var(--main-background-color);
  border: 1px solid var(--main-text-color);
  border-radius: 4px;
}

.board-view-container .board-column.column-dragging {
  opacity: 0.5;
  transform: scale(0.98) rotate(2deg);
  transition: opacity 0.2s ease, transform 0.2s ease;
  box-shadow: 4px 8px 16px rgba(0, 0, 0, 0.3);
}

.board-view-container .board-column h3 input {
  background: transparent;
  border: none;
  outline: none;
  font-size: inherit;
  font-weight: inherit;
  color: inherit;
  width: 100%;
  font-family: inherit;
}

.board-view-container .board-column .edit-icon {
  opacity: 0;
  margin-left: 0.5em;
  transition: opacity 0.2s ease;
  color: var(--muted-text-color);
  cursor: pointer;
}

.board-view-container .board-column h3:hover .edit-icon,
.board-view-container .board-note:hover .edit-icon {
  opacity: 1;
}


.board-view-container .board-note {
  box-shadow: 1px 1px 4px rgba(0, 0, 0, 0.25);
  margin: 0.65em 0;
  padding: var(--card-padding);
  border-radius: 5px;
  cursor: move;
  position: relative;
  background-color: var(--main-background-color);
  border: 1px solid var(--main-border-color);
  transition: transform 0.2s ease, box-shadow 0.2s ease, opacity 0.15s ease, margin-top 0.2s ease;
  opacity: 1;
  line-height: var(--card-line-height);
  overflow-wrap: break-word;
  overflow: hidden;
}

.board-view-container .board-note .icon {
  margin-right: 0.25em;
  display: inline;
}

.board-view-container .board-note > .edit-icon {
  position: absolute;
  top: 8px;
  right: 4px;
  padding: 2px;
  background-color: var(--main-background-color);
}

.board-view-container .board-note:hover > .edit-icon {
  position: absolute;
  top: 8px;
  right: 4px;
  color: var(--main-text-color);
  background-color: var(--main-background-color);
  padding-left: 6px;
}

.board-view-container .board-note.fade-in {
  animation: fadeIn 0.15s ease-in;
}

.board-view-container .board-note.fade-out {
  animation: fadeOut 0.15s ease-out forwards;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeOut {
  from { opacity: 1; transform: translateY(0); }
  to { opacity: 0; transform: translateY(-10px); }
}

.board-view-container .board-note:hover {
  transform: translateY(-2px);
  box-shadow: 2px 4px 8px rgba(0, 0, 0, 0.35);
}

.board-view-container .board-note.dragging {
  opacity: 0.5;
  transform: rotate(5deg);
  z-index: 1000;
  box-shadow: 4px 8px 16px rgba(0, 0, 0, 0.5);
}

.board-view-container .board-note.editing {
  box-shadow: 2px 4px 8px rgba(0, 0, 0, 0.35);
  border-color: var(--main-text-color);
  display: flex;
  align-items: center;
  padding: 0;
}

.board-view-container .board-note.editing input,
.board-view-container .board-note.editing textarea {
  background: transparent;
  border: none;
  outline: none;
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  width: 100%;
  padding: var(--card-padding);
  line-height: var(--card-line-height);
}

.board-view-container .board-note.editing textarea {
  height: auto;
  field-sizing: content;
  resize: none;
}

.board-drop-placeholder {
  height: 40px;
  margin: 0.65em 0;
  padding: 0.5em;
  border-radius: 5px;
  background-color: rgba(0, 0, 0, 0.15);
  opacity: 0;
  transition: opacity 0.15s ease, height 0.2s ease;
  box-sizing: border-box;
}

.board-drop-placeholder.show {
  opacity: 0.6;
}

.column-drop-placeholder {
  width: 250px;
  flex-shrink: 0;
  height: 200px;
  border-radius: 8px;
  background-color: rgba(0, 0, 0, 0.1);
  opacity: 0;
  transition: opacity 0.15s ease;
  margin: 0 0.5em;
}

.column-drop-placeholder.show {
  opacity: 0.6;
}

.board-new-item {
  margin-top: 0.5em;
  padding: 0.5em;
  border-radius: 5px;
  color: var(--muted-text-color);
  cursor: pointer;
  transition: all 0.2s ease;
  background-color: transparent;
}

.board-new-item:hover {
  border-color: var(--main-text-color);
  color: var(--main-text-color);
  background-color: var(--hover-item-background-color);
}

.board-new-item .icon {
  margin-right: 0.25em;
}

.board-add-column {
  width: 180px;
  flex-shrink: 0;
  height: 60px;
  border-radius: 8px;
  padding: 0.5em;
  background-color: var(--accented-background-color);
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--muted-text-color);
  font-size: 0.9em;
  align-self: flex-start;
}

.board-add-column:hover {
  border-color: var(--main-text-color);
  color: var(--main-text-color);
  background-color: var(--hover-item-background-color);
}

.board-add-column .icon {
  margin-right: 0.5em;
  font-size: 1.2em;
}

.board-add-column input {
  background: var(--main-background-color);
  border: 1px solid var(--main-text-color);
  border-radius: 4px;
  padding: 0.5em;
  color: var(--main-text-color);
  font-family: inherit;
  font-size: inherit;
  width: 100%;
  text-align: center;
}

.board-drag-preview {
  position: fixed;
  z-index: 10000;
  pointer-events: none;
  opacity: 0.8;
  transform: rotate(5deg);
  box-shadow: 4px 8px 16px rgba(0, 0, 0, 0.5);
  background-color: var(--main-background-color);
  border: 1px solid var(--main-border-color);
  border-radius: 5px;
  padding: 0.5em;
  font-size: 0.9em;
  max-width: 200px;
  word-wrap: break-word;
}