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HTML

<input type="checkbox" class="input--checkbox" name="access_3833_774" value="chanel_idea"> Текст

CSS

/* Checkbox */

/*input[type="checkbox"]:not([disabled]) {*/
/*  background: red!important;*/
/*}*/

.input--checkbox {
    -webkit-appearance: none;
    -moz-appearance: none;
    -ms-appearance: none;
    -o-appearance: none;
    appearance: none;
    position: relative;
    top: 2px;
    right: 0;
    bottom: 0;
    left: 0;
    width: 14px;
    height: 14px;
    min-width: 14px;
    min-height: 14px;
    max-width: 14px;
    max-height: 14px;
    transition: all 0.15s ease-out 0s;
    background: #fff;
    border: 1px solid #E0E0E0;
    color: #fff;
    cursor: pointer;
    display: inline-block;
    margin: 0;
    outline: none;
    position: relative;
}

.input--checkbox:hover {
    border: 1px solid #2d9cdb;
}

.input--checkbox[disabled]:checked {
    background: #c2e9ff;
    border: 1px solid #c2e9ff;
}

.input--checkbox:checked {
    background: #2d9cdb;
    border: 1px solid #2d9cdb;
}

.input--checkbox:checked::before {
    content: '';
    position: absolute;
    left: 4px;
    top: .5px;
    width: 3px;
    height: 7px;
    border: solid #fff;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}


.input--checkbox:checked::after {
    background: #2d9cdb;
    content: '';
    display: block;
    position: relative;
}

/* Checkbox END */

JavaScript

const inputEl = document.querySelector('input');

inputEl.addEventListener('change', function() {
	console.log(`Is checked? : ${this.checked}`)
})