SOURCE

<div class="box">
	<span class="item"></span>
    <span class="item"></span>
    <span class="item"></span>
</div>

.box {
    margin: auto;
    width: 100px;
    height: 100px;
    background-color: white;
    border-radius: 5px;
    padding: 10px;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-around
}

.box>span:nth-child(1) {
    background-color: green;
    display: flex;
    width: 20px;
    height: 20px;
    border-radius: 10px;
}

.box>span:nth-child(2) {
    background-color: blue;
    display: flex;
    width: 20px;
    height: 20px;
    margin: auto 0;
    border-radius: 10px;
}

.box>span:nth-child(3) {
    background-color: red;
    display: flex;
    width: 20px;
    height: 20px;
    border-radius: 10px;
    margin-top: 82%;
}