html - ul最大高度设置

Question

ul我想设置ul的最大高度为200px,如果li数量过多超过200px，用滚动显示
但是我这么设定不管用

.content {
  max-height: 220px;
  background-color: #0C88E8;
}

Answer 1

overflow: auto or overflow: scroll
simply wrote a demo

Answer 2

Add oneoverflow: scroll

Answer 3

overflow-y:scroll;