header {
  position: fixed;
  top: 0;
  width: 70px;
  height: 100vh;
  overflow: hidden;
  transition: width .3s ease;
  border-right: 1px solid #000;
}

header:hover {
  width: 200px;
}

main {
  padding-left: 70px;
}

.header {
  padding: 10px;
}

.header img {
  width: 100%;
  height: 70px;
  background: #aaa;
}


/* ‹ĆŽíŠÇ—ť */
#category .handle,
#tag .handle {
  cursor: grab;
}