.grid-container {
  position: relative;
  width: 100%;
  height: 100%;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(50px, 1fr));
}

.container {
  position: absolute;
  background-color: #3498db;
  border: 2px solid #2980b9;
  cursor: move;
  resize: both;
  overflow: hidden;
}

.resizeHandle {
  position: absolute;
  bottom: 0;
  right: 0;
  width: 10px;
  height: 10px;
  background-color: #e74c3c;
  cursor: se-resize;
}