center vertically in v-col code example

Example: v-row center vertically

Vertical - align: start, center, end, baseline, stretch
Horizontal - justify: start, cener, end, space-around, space-between

Vertical Alignment: 
<v-row align="start"></v-row> // top
<v-row align="center"></v-row> // middle
<v-row align="end"></v-row> // bottom
<v-row align="stretch"></v-row> // fill height


Horizontal Justification:
<v-row justify="start"></v-row> // left
<v-row justify="center"></v-row> // center
<v-row justify="end"></v-row> // right
<v-row justify="space-around"></v-row> // centered - spaced evenly around
<v-row justify="space-between"></v-row> // not centered - spaced evenly between