delete

HTML

<div class="wrapper">
    <div class="box"></div>
    <div class="box"></div>
    <div class="box"></div>
    <div class="box"></div>
    <div class="box"></div>
    <div class="box"></div>
</div>

CSS

.wrapper {}

.box {
    display: inline-block;
    width: 100px;
    height: 100px;
    
    vertical-align: middle;
    
    background: grey;
}
.box:first-child {
    background: green;
}
.box:last-child {
    background: black;
}
.box:nth-child(3) {
    background: pink;
}