模板:纯白魔方/common.css

.lw-treebut {
  display: block;
  box-sizing: border-box;
  position: relative;
  width: 100%;
  margin: 4px 0;
  padding: 0 12px 0 1.5em;
  line-height: 1.2;
  font-size: 1rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  text-align: left;
  border: none;
  background: linear-gradient(to right, #ddd, transparent);
  border-radius: 999px 0 0 999px;
  cursor: pointer;
  user-select: none;
  transition: color .18s ease;
}

.lw-treebut::before {
  content: "◎";
  position: absolute;
  left: .45em;
  top: 50%;
  transform: translateY(-50%);
  color: currentColor;
  font-size: .9em;
  line-height: 1;
}

@media (min-width: 768px) {
  .lw-treebut {
    width: 33.3333%;
  }
}

.lw-treebut:hover,
.lw-treebut:focus {
  background: linear-gradient(to right, #000, grey);
  color: #fff;
  outline: none;
}

.lw-treebut:active {
  filter: brightness(1.15);
}