* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

.wrapper {
  display: flex;
  margin: 50px auto;
  width: 300px;
  overflow: hidden;
  resize: horizontal;
  border-radius: 8px;
  padding: 15px;
  box-shadow: 20px 20px 60px #bebebe, -20px -20px 60px #ffffff;
}

.text {
  font-size: 20px;
  overflow: hidden;
  text-overflow: ellipsis;
  text-align: justify;
  position: relative;
  line-height: 1.5;
  max-height: 4.5em;
}

.text::before {
  content: '';
  height: calc(100% - 26px);
  float: right;
}

.text::after {
  content: '';
  width: 999vw;
  height: 999vw;
  position: absolute;
  box-shadow: inset calc(100px - 999vw) calc(30px - 999vw) 0 0 #fff;
  margin-left: -100px;
}

.btn {
  position: relative;
  float: right;
  clear: both;
  margin-left: 20px;
  font-size: 16px;
  padding: 0 8px;
  background: #3F51B5;
  line-height: 24px;
  border-radius: 4px;
  color: #fff;
  cursor: pointer;
}

.btn::after {
  content: '展开'
}

.exp {
  display: none;
}

.exp:checked+.text {
  max-height: none;
}

.exp:checked+.text::after {
  visibility: hidden;
}

.exp:checked+.text .btn::before {
  visibility: hidden;
}

.exp:checked+.text .btn::after {
  content: '收起'
}

.btn::before {
  content: '...';
  position: absolute;
  left: -5px;
  color: #333;
  transform: translateX(-100%)
}