css: 

/* 课程列表 */
.courses_lists{
  width: 100%;
  
}

/* 专栏列表 */
.course_row{
  display: flex;
  flex-direction: row;
  align-content: space-around;
  flex-wrap: wrap;
  padding: 32rpx;
}
.course_item{
  width: 33%;
  display: flex;
  flex-direction: column;
  align-content: space-around;
  align-items: center;
  margin-bottom: 30rpx;
}

.course_img{
  width: 90%;
  height: 220rpx;
  display: block;
}

.course_text{
  font-size: 26rpx;
  color: #222;
  margin-top: 20rpx;
}


/* 更多一行 */
.rowbetween{
  display: flex;
  justify-content: space-between;
}

.more{
  padding:20rpx 32rpx;
  font-size: 32rpx;
  color: #222;
  font-weight: bold;
}

.more .small{
  font-size: 26rpx;
  color: #888;
}

效果：