How to make my checkboxes transparent - html

Question

How do i make my checkboxes transparant? It does work with text fields and buttons but it doesnt seem to work with checkboxes.
This is the form of my code.
#checkbox {
width: 20px;
height: 20px;
cursor: pointer;
vertical-align: bottom;
color: black;
background-color: rgba(0, 0, 0, 0.08);
}
<div class="checkbox check-transparent">
<label>
<input type="checkbox" id="checkbox">Onthoud mij
</label>
</div>

Answer 1

The only thing that can be done for a regular checkbox is making it transparent by decreasing its opacity but it also lightens the tick mark inside if checked. A workaround is, having the checkbox wrapped in a div and changing the color of the checkbox when checked like shown in the snippet below:
#checkb {
width: 20px;
height: 20px;
cursor: pointer;
background: rgba(40,40,40,0.2);
color:black;
-webkit-appearance: none;
-moz-appearance: none;
appearance: none;
border: none;
position: relative;
left: -5px;
top: -5px;
}
#checkb:checked {
background: rgba(40,40,40,0.7);
}
.checkbox-container {
position: absolute;
display: inline-block;
margin: 20px;
width: 100px;
height: 100px;
overflow: hidden;
}
<div class="checkbox-container">
<input type="checkbox" id="checkb"/> Input
</div>

Answer 2

You can also (classic method that allows to restyle a checkbox crossbrowser following standards)
take input ahead and outside the label
link the label to its input via attribute for
use a pseudo on label to draw a checkbox via css and also apply size and background.
hide the checkbox
label {
display: inline-block;
}
#checkbox {
display: none;
}
label:before {
content: '';
cursor: pointer;
vertical-align: bottom;
color: black;
background-color: rgba(0, 0, 0, 0.1);
/* average checkbox styling */
line-height: 1.1em;
font-weight: bold;
text-align: center;
font-size: 20px;
height: 20px;
width: 20px;
display: inline-block;
box-shadow: inset 0 0 1px 1px rgb(153, 154, 154), inset 0 0 1px 2px white, inset 0 0 1px 2px white, inset 2px 2px 1px 1px rgb(182, 187, 192), inset -1px -1px 2px 1px rgb(182, 187, 192), inset 8px 8px 4px -4px rgb(182, 187, 192);
box-sizing: border-box;
}
:checked+label:before {
content: '\2713';
color: rgb(74, 95, 151);
}
:checked+label {
color: rgb(74, 95, 151);
}
label:hover {
color: rgb(28, 50, 125);
}
label:hover:before {
box-shadow: inset 0 0 1px 1px rgb(95, 133, 156), inset 0 0 1px 2px rgb(198, 237, 252), inset 0 0 1px 2px rgb(198, 237, 252), inset 2px 2px 1px 1px rgb(134, 203, 246), inset -1px -1px 2px 1px rgb(134, 203, 246), inset 8px 8px 4px -4px rgb(134, 203, 246);
}
<div class="checkbox check-transparent">
<input type="checkbox" id="checkbox">
<label for="checkbox"> Onthoud mij
</label>
</div>