请问为什么前面的色块显示不出来

/* pages/join/join.wxss */

page{

  background: #f3f3f3;

}

.banner{

  display: block;

  width: 100%;

  height: 340rpx;

}

.block{

  background: #fff;

  margin-top: 15rpx;

}

.block-title{

  position: relative;

  font-size: 34rpx;

  line-height: 1.5;

  color: #f00;

  padding: 10rpx 20rpx;

  text-indent: 40rpx;

}

.block-title::before{

  position: absolute;

  left: 20rpx;

  top: 4rpx;

  content: "";

  width: 10prx;

  height: 40rpx;

  background:#f00;

}