How to vertically align 2 different sizes of text?

Question

I know to vertically align text to the middle of a block, you set the line-height to the same height of the block.

However, if I have a sentence with a word in the m

Answer 1

This works

header > span {
    margin: 0px 12px 0px 12px;
    vertical-align:middle;
}
.responsive-title{
    font-size: 12vmin;
    line-height: 1em;
}
.responsive-subtitle{
    font-size: 6vmin;
    line-height: 2em;
}

  Foo
  Bar