Please, the next time please use a jsfiddle to show your code so it's easier for us to give you a quick answer. Regarding to your question, try adding the css property position: relative to your .introBar css rule, so you'll have:
.introBar{
position: relative;
}
then, you can position absolute your .introLogo regarding to .introBar.
.introLogo{
bottom: 20%;
position: absolute;
width: 100%;
}