css 伪类:last-child等不起作用

<style>
#icons{
    border: 1px solid bisque;
    height: 250px;
}

#icons .column{//每一列
    width: 25%;
    display: inline-block;
    float: left;
    text-align: center;
}


#icons .column .txt{//每列文字
    width: 100%;
    height: 52px;
    margin-top: 134px;
    border-right: 2px solid #787b83;//在此处加隔条
    
}

#icons .column .txt:last-child{
    border-right: none;
}


#icons .column .txt p{
    width: 160px;
    height: 52px;
    font-size: 14px;
    line-height: 18px;
    color: #767777;
    margin-left: 25%;
}

<div id="icons">
            <div class="column column1">
                <div class="txt">
                    <p>打造全新世界观，让你更爱你的生活</p>
                </div>
            </div>
            <div class="column column2">
                <div class="txt">
                    <p>丰富多彩的公益活动，发挥新世界的主人公意识</p>
                </div>
            </div>
            <div class="column column3">
                <div class="txt">
                    <p>时尚的新理念，超前体验未知的生活</p>
                </div>
            </div>
            <div class="column column4">
                <div class="txt">
                    <p>完善的培养机制，培养你全新的世界观</p>
                </div>
            </div>
        </div>

#icons .column:last-child .txt{
    border-right: none;
}