section {
    background: red;
    border: 2px solid black;
    text-align:center
}

article {
    background: yellow;
    display: inline-block;
    border: 2px solid black;
    width: 30%;
    margin: 5px 0;
    height: 300px;
  position: relative;
}
p {
    margin: 0;
    position: absolute;
    top: 50%;
    left: 50%;
    -ms-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
}