html {
    height: 100%;
}
body {
    height: 98%;
    background-color: black;
    color: white;
}
.Aligner {
    display: flex;
    align-items: center;
    min-height: 24em;
    justify-content: center;
    height: 100%;
}

.Aligner-item {
    flex: 1;
}

.Aligner-item--top {
    align-self: flex-start;
}

.Aligner-item--bottom {
    align-self: flex-end;
}

.Aligner-item--fixed {
    flex: none;
    max-width: 50%;
}