<div class="c1">
<div class="flb flbox1">box1</div>
<div class="flb flbox2">box2</div>
<div class="flb flbox3">box3</div>
</div>
<div class="c2">
<div class="flb flbox1">box1</div>
<div class="flb flbox2">box2</div>
<div class="flb flbox3">box3</div>
</div>
.flb {
float: left;
width: 100px;
height: 100px;
}
.flbox1{background-color: rgba(33, 114, 214, 0.8);}
.flbox2{background-color: rgba(255, 82, 0, 0.8);}
.flbox3{background-color: rgba(90, 243, 151, 0.8);}
.container1 {
clear: both;
}