How to write the style of CSS3 Tianzi grid list

In many projects, it is necessary to implement the function of grid display, with a gray dividing line in the middle and none on both sides.

As shown in the figure:

According to the general idea, set the width of li and add style to the li tag through nth-of-type(n){}.

We set each li to a width of 33.33%, but when we add a 1px border, the rightmost content gets pushed down.

This can be achieved by adding :before :after pseudo-class elements to the parent ul. Without occupying the width of li

When displaying 3 columns, this is achieved by adding :before to ul

CSS

<style>
        ul li{ list-style: none;}
        .mp-list{   
            position: relative;
            overflow: hidden;
            z-index: 0;
            background-color: #fff;
        }        
        .mp-list:before {
            content: '';
            position: absolute;
            width: 33.33%;
            left: 33.33%;
            height: 100%;
            border-left: .02rem solid #ddd;
            border-right: .02rem solid #ddd;
        }
        .mp-list li {
            width: 33.33%;
            height: 2rem;
            line-height: 2rem;
            font-size: .28rem;
            text-align: center;
            border-bottom: .02rem solid #ddd;
            margin-bottom: -1px;
            float: left;
            position: relative;
            z-index: 10;
            color: #212121;
        }
        .mp-list li a {
            color: #212121;
            display: block;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
            font-size: .28rem;
        }
    </style>

HTML

<ul class="mp-list">
    <li><a hybrid-link="" href="" title="">Hong Kong</a></li>
    <li><a hybrid-link="" href="" title="">Macao</a></li>
    <li><a hybrid-link="" href="" title="">Taiwan</a></li>
    <li><a hybrid-link="" href="" title="">Bangkok</a></li>
    <li><a hybrid-link="" href="" title="">Singapore</a></li>
    <li><a hybrid-link="" href="" title="">Seoul</a></li>
    <li><a hybrid-link="" href="" title="">Tokyo</a></li>
    <li><a hybrid-link="" href="" title="">Jeju Island</a></li>
    <li><a hybrid-link="" href="" title="">Pattaya</a></li>
</ul>

When 4 columns are displayed, add styles to :after. Note that you need to change the width of li and the position of .mp-list:before.

.mp-list:after {
    content: '';
    position: absolute;
    width: 10%;
    left: 75%;
    height: 100%;
    border-left: .02rem solid #ddd;
    border-right: 0;
}

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