.drawer {
  position: fixed;
  bottom: 0;
  left: -300px; /* 隐藏状态 */
  width: 300px;
  background-color: #fff;
  transition: left 0.3s ease;
  z-index: 99;
}
 
.drawer.open {
  left: 0; /* 显示状态 */
}
 
.drawer-content {
	z-index: 99;
}
 
.overlay {
  position: fixed;
  left: 0;
  width: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 80;
}

.overlay.open {
	width: 750rpx;
}