html, body {
    height: 100%;
}

.vframe {
    border: solid blue 1px;
    height: 100%;
    text-align: center;
}

.vframe:before {
    content: "";
    width: 1px;
    height: 100%;
    display: inline-block;
    vertical-align: middle;
}

.vcenter {
    display: inline-block;
    border: solid red 1px;
    vertical-align: middle;
}