.center-container {
    text-align: center;
    height: 450px;
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    margin: auto;
    font-size: 20px;
}

.boxy {
    border: 1px solid #000;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
    white-space: pre;
    width: 100px;
    height: 100px;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    margin: auto;
}

.center-container-new {
    position:absolute;
    left:50%;
    top:50%;
    margin:-150px 0 0 -150px;
    text-align: center;
    font-size: 1.25em;
 }

.center-container-new pre {
    display: inline-block;
    text-align: left;
 }