<div class="aaa"></div>
<div class="aaa"></div>
<div class="aaa"></div>
<div class="aaa"></div>
<div class="aaa"></div>
<div class="aaa"></div>
<div class="aaa"></div>
<div class="aaa"></div>
<div class="aaa"></div>
<div class="aaa"></div>
.aaa{
height: 200px;
border:1px solid #ccc;
position: relative;
}
.aaa::before{
content:'';
width: 100px;
height: 100px;
position: absolute;
top:0;
left:0;
z-index: 1;
background-color: #501010;
}
.aaa:nth-of-type(2n+1)::before{
background-color: #bbf142;
}
.aaa:nth-of-type(3n+1)::before{
background-color: #bf7979;
}
.aaa:nth-of-type(4n+1)::before{
background-color: #b3165f;
}
.aaa:nth-of-type(5n+1)::before{
background-color: #103289;
}
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