Why does this span have a bigger height than it's parent - html

Question

I'm doing a progression throught the site bar and I'm having a problem. There are four span elements that represents the sections of the frontpage, when you click on one of them it scroll to that section position. The problem is for some reason, the span element are taller than the div cointaining it, and for that, I can't align it vertically. It ain't a problem until you try to use the website on smaller resolutions, in wich, the span elements overflows the div.
Here is what I'm talking about
See that the right attribute is because of a script that positioned the span according to the section position.
And here is where the problem became obvious
Here is the HTML :
<header id="masthead" class="site-header" role="banner" style="position: relative; top: auto;">
<div class="container-fluid">
<div class="row">
<div id="progressDiv">
<span id="progBar">
</span>
<div id="SectionsPos">
<a href="/#features">
<span id="novedPos" class="sectPos"> Novedades </span>
</a>
<a href="/#about">
<span id="redesPos" class="sectPos tooBig"> Redes Sociales </span>
</a>
<a href="#ProductosPrinc">
<span id="prodPos" class="sectPos"> Productos </span>
<a href="#Contacto">
<span id="contPos" class="sectPos"> Contacto </span>
</a>
</div>
</div>
</div>
</div>
And here is the CSS :
#progressDiv {
display: block;
border: solid 1px;
border-color: #d9b25f;
position: relative;
width: 100%;
height: 10vh;
}
#progBar {
height: inherit;
display: block;
width: 0%;
background: #d9b25f;
max-width: 100%;
}
#SectionsPos{
display: block;
position: absolute;
width: 100%;
top: 50%;
height: 10vh;
margin-top: -5vh;
}
.sectPos {
font-weight: 900;
color: white!important;
position: absolute;
}
Excuse my English, it is not my native language, if there is something that it's not completely clear please let me know and I'll try to explain myself better

Answer 1

I kind of solved it but it is not an actual solution but a way to a avoid the problem, i changed de vh for pixels units, aparently you cant do what i wanted to do using vh units