CENTRALIZAR TEXTO DIV | HTML5 e CSS3 parte 2: posicionamento, listas e navegação

<!DOCTYPE html>
<html lang="pt-BR">
<head>
    <meta charset="utf-8">

    <title>position: absolute</title>

    <link rel="stylesheet" type="text/css" href="css/reset.css">
    <link rel="stylesheet" type="text/css" href="css/position.css">

</head>
<body>
    <div class="elementExample elementExample_first">
        Example_first
    </div>

    <div class="elementExample elementExample_secound">
        Example_second
    </div>

    <div class="elementExample elementExample_last">
        <div class="elementExample-internal">
            Example-internal            
        </div>
    </div>

</body>
</html>

*{
    margin: 0;
    padding: 0;
    border: 0;
}

body{
    background: #b2bec3;
    font-family: "Open Sans", sans-serif;
}

ul, ol, li{
    list-style: none;
}

.elementExample {
    width: 200px;
    height: 200px;
    line-height: 200px;
    color: #fff;
    text-transform: uppercase;
    text-align: center;
    cursor: pointer;
}

.elementExample_first{
    position: absolute;
    right: 0;
    background: #6c5c7e;
}

.elementExample_secound{
    background-color: #00b894;
    position: absolute;
    top: 50%;
    left: 50%;
    /*transform: translateX(-50%) translateY(-50%);*/
    transform: translate(-50%, -50%);
}

.elementExample_last{
    background: #d63031;
    position: absolute;
}

.elementExample-internal{
    width: 100px;
    height: 100px;
    line-height: 100px;
    background-color: #00cec9;

    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);

}