To change the color of the checkmark, change the border color on the ::after style. Add CSS Hide the checkboxes by setting the visibility property to its "hidden" value. We use the sibling selector (~) for all our states, like :checked or :disabled. Thanks, Mihail, I am still learning and I want to use Bootstrap so I will check W3schools first, also I've tried many ways to override that with no hope, Just a question can I use some materialize with the bootstrap project? :). 2 Answers. Javascript could swap them for you based on a variable that you set each time the image is clicked. How can I horizontally center an element? Color Picker. This color can be changed by manipulating the custom-control-input class. Structurally, our s and