custom-toggle.php

<?php

/**
 * Override cookiebanner template html
 * @param string $html
 *
 * @return string
 */

function cmplz_custom_banner_file($path, $filename){
  if ($filename === 'cookiebanner.php' ) {
    error_log("change path to ".trailingslashit(WPMU_PLUGIN_DIR).'cookiebanner/cookiebanner.php');
    return trailingslashit(WPMU_PLUGIN_DIR).'cookiebanner/cookiebanner.php';
  }
  return $path;
}

add_filter('cmplz_template_file', 'cmplz_custom_banner_file', 10, 2);

/**
 * Completely override CSS generated by Complianz
 * @param string $css
 *
 * @return string
 */

function my_custom_banner_css($css){
	ob_start();
	//add css below
	?>
	.cmplz-cookiebanner .cmplz-categories .cmplz-category .cmplz-banner-checkbox .cmplz-label {
	  padding-left:0px!important;
  }
  .cmplz-cookiebanner .cmplz-categories .cmplz-category .cmplz-banner-checkbox input.cmplz-consent-checkbox:checked + .cmplz-label::before {
	  display:none!important;
  }
  .cmplz-cookiebanner .cmplz-categories .cmplz-category .cmplz-banner-checkbox .cmplz-label:before {
  	display:none!important;
  }
  .cmplz-cookiebanner .cmplz-categories .cmplz-category .cmplz-banner-checkbox .cmplz-label:after {
	  display:none!important;
  }
  .cmplz-cookiebanner .cmplz-categories .cmplz-category .cmplz-category-header {
  }
  .cmplz-always-active {
	  color: #16a085!important;
  }

@charset "UTF-8";

  input[type=checkbox] {
    position: absolute;
    opacity: 0;
    z-index: -1;
  }
  .cmplz-label {
    display: flex;
    align-items: center;
    width: 2em;
    height: 1em;
    background: #690e0e;
    border-radius: 2.5em;
    transition: all 0.5s ease;
    cursor: pointer;
  }
  .cmplz-custom-toggle {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 1em;
    height: 1em;
    background: #9d1111;
    border-radius: 50%;
    transition: all 0.5s ease;
    box-shadow: 0 0 8px rgba(0, 0, 0, 0.3);
  }
  .cmplz-custom-toggle:before {
    content: "×";
    color: white;
    font-size: 0.8em;
    font-weight: bold;
  }
  input[type=checkbox]:checked + .cmplz-label {
    background: #16a085;
  }
  input[type=checkbox]:checked + .cmplz-label .cmplz-custom-toggle {
    margin-left: 50%;
    background: #1abc9c;
  }
  input[type=checkbox]:checked + .cmplz-label .cmplz-custom-toggle:before {
    content: "✔";
  }
  .cmplz-cookiebanner .cmplz-categories .cmplz-category .cmplz-description {
	  line-height: 1.5em;
	}
	<?php
	return ob_get_clean();
}
add_filter('cmplz_cookiebanner_css', 'my_custom_banner_css');