Z-index with higher value is not placing over lower valued ones - html

Question

I'm having troubles getting a z-index value element with a higher integer to place over another.
This is the issue I am facing.
The bottom half of the register button is being overlapped by the background image.
The code below has been adjusted a bit to only show the code that is being used here. You can see the full site by visiting: https://stangline.com/.
Here is the code:
CSS
.buttonFrame {
margin: 80px auto 50px auto;
display: block;
z-index: 4;
position: relative;
}
.buttonList {
display: inline-block;
vertical-align: top;
}
.homeButton {
font-size: 2rem;
text-decoration: none;
text-transform: uppercase;
letter-spacing: .2rem;
padding: 20px;
cursor: pointer;
box-sizing: border-box;
-webkit-transition: all 0.3s ease-in-out;
transition: all 0.3s ease-in-out;
position: relative;
z-index: 4;
}
#homeRight {
width: 60%;
height: 100%;
position: absolute;
right: 0;
top: 0;
display: block;
z-index: 2;
}
#homeRightImgFill {
background-position: center center;
background-repeat: no-repeat;
background-size: contain;
width: 95%;
position: relative;
margin: 0 auto;
padding-top: 50%;
z-index: 2;
}
HTML
<div class="buttonFrame">
<a href="/forums" class="homeButton homeButtonGradient buttonList">
Visit Forum
</a>
<a href="/register/" class="homeButton buttonList homeButtonBlue p-navgroup-link--register" data-xf-click="overlay" data-follow-redirects="on">
<span>Register</span>
</a>
</div>
</div>
</div>
</div><div class="homeCont" id="homeRight">
<div id="homeRightImgFill"></div>
</div>

Answer 1

Apply z-index:4 on homeCont class