HTML element set to visible but still invisible - html

Question

I am currently working on a website and I have an element that I have explicitly declared: display: inline-block and visibility: visible however, the element is still invisible. This is only occurring on mobile devices. The invisible element is <div id="clock">.
#font-face {
font-family: 'bitwise';
src: url('bitwise.ttf');
font-display: swap;
}
* {
font-family: 'bitwise', monospace;
margin: 0;
padding: 0;
outline: 0;
}
:root {
background-color: #008080;
}
body,
html,
.wrapper {
width: 100%;
height: 100%;
}
span {
color: #FFFFFF;
font-size: 18pt;
text-align: center;
display: inline-block;
}
h1 {
color: #FFFFFF;
text-align: center;
display: inline-block;
}
input {
font-family: 'bitwise', monospace;
background-color: #535353;
color: #FFFFFF;
font-size: 18pt;
overflow: hidden;
text-align: center;
line-height: inherit;
height: inherit;
}
img:not(.noresize) {
width: 35%;
height: 35%;
}
video {
width: 35%;
height: 35%;
}
a:link {
color: #EFCF7C;
}
a:visited {
color: #105733;
}
button {
background-color: #105733;
border: none;
color: white;
padding: 15px 32px;
text-align: center;
text-decoration: none;
display: inline-block;
font-size: 18px;
margin: 4px 2px;
}
#back {
background-color: #660000;
border: none;
color: white;
padding: 15px 32px;
text-align: center;
text-decoration: none;
display: inline-block;
font-size: 18px;
margin: 4px 2px;
}
#taskbar {
position: absolute;
overflow: hidden;
bottom: 0;
width: 100%;
height: 27px;
background-color: silver;
box-shadow: inset 0px 1px #dfdfdf, inset 0px 2px #ffffff;
}
.center {
display: flex;
flex-wrap: wrap;
position: absolute;
left: 50%;
top: 50%;
transform: translate(-50%, -50%);
text-align: center;
align-items: center;
justify-content: center;
}
#start {
float: left;
}
#clock {
float: right;
position: relative;
text-align: center;
}
#clocktime {
font-family: 'Arial', serif;
font-size: 13px;
color: #000000;
position: relative;
bottom: 23px;
left: 17px;
}
#icons {
padding-top: 8px;
}
#content {
padding-top: 10px;
}
.break {
flex-basis: 100%;
height: 0;
}
#content {
width: 675px;
height: 300px;
}
#media screen and (max-width: 1079px) {
html,
body {
overflow: hidden;
}
#clock {
float: right;
position: relative;
bottom: 100px;
text-align: center;
display: inline-block;
visibility: visible;
}
#clocktime {
font-family: 'Arial', serif;
font-size: 13px;
color: #000000;
position: relative;
bottom: 23px;
left: 17px;
}
}
<div id="taskbar">
<div id="start"><img class="noresize" src="/assets/start.png"></div>
<div id="clock"><img class="noresize" src="/assets/clock.png">
<div id="clocktime"></div>
</div>
</div>
<div id="icons"><img class="noresize" src="/assets/icons.png"></div>
<div class="center"><img class="noresize" src="/assets/ie.png"></div>
<div class="center" id="content">
Content here.
</div>
Screenshot 1 - What the page should look like. Note the clock in the lower-right corner.
Screenshot 2 - What the page actually looks like on mobile.
Screenshot 3 - Chrome DevTools showing the element as being in a visible spot, but still not being visible.

Answer 1

I see that that css is only appliable when max-width is equal to 1079px.
Try to increase that number in inspector element to see what happens.

Answer 2

So it turns out I had overflow: hidden set on #taskbar and this means that any children inside of the taskbar will not display, even if they are in a "visible" area. Adding bottom: 32px to set it inside of the taskbar worked.
Updated CSS:
#taskbar {
position: absolute;
overflow: hidden;
bottom: 0;
width: 100%;
height: 27px;
background-color: silver;
box-shadow: inset 0px 1px #dfdfdf, inset 0px 2px #ffffff;
}
<snip>
#media screen and (max-width: 1079px) {
#clock {
bottom: 32px;
}
}