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<div class="bir">Doctrina philosophari.</div>

<div class="iki">Fugiat proident cupidatat, expetendis quem de.</div>

<div class="uc">A ita transferrem ab officia quorum ullamco, aut eram noster est officia.</div>
.bir, .iki, .uc{
    display: inline;
    width: 400px;
    height: 400px;
    color:#fff;
}
div.bir{
    background-color: gray;

}
div.iki{
    background-color: red;
}
div.uc{
    background-color: green;
}