You can customize checkboxes in CSS using various properties according to your design requirements. However, a point to note here is that the look of the checkbox is largely determined by the browser that the user is using and hence, the direct styling of checkbox may not appear consistent across different browsers.
Also, the default checkbox cannot be fully customized. Therefore developers often hide the default checkbox and replace it with images or SVGs that can be styled with CSS.
Here is an example of customizing checkboxes with CSS:
1. HTML:
```
```
1. CSS:
```
/* Hide the default checkbox */
.custom-checkbox input {
position: absolute;
opacity: 0;
cursor: pointer;
}
/* Create a custom checkbox */
.checkmark {
position: relative;
height: 20px;
width: 20px;
background-color: #eee;
}
/* On mouse-over, add a grey background color */
.custom-checkbox:hover input ~ .checkmark {
background-color: #ccc;
}
/* When the checkbox is checked, add a blue background */
.custom-checkbox input:checked ~ .checkmark {
background-color: #2196F3;
}
/* Create the checkmark/indicator (hidden when not checked) */
.checkmark:after {
content: “”;
position: absolute;
display: none;
}
/* Show the checkmark when checked */
.custom-checkbox input:checked ~ .checkmark:after {
display: block;
}
/* Style the checkmark */
.custom-checkbox .checkmark:after {
left: 7px;
top: 3px;
width: 5px;
height: 10px;
border: solid white;
border-width: 0 3px 3px 0;
transform: rotate(45deg);
}
```
This will create a custom checkbox with a blue background when checked and gray background when hovered over. The checkmark is created using the `::after` pseudo-element.
