CookieChimp’s dashboard allows you to customise the look and feel of the banner and modal. However, if you want to go beyond the options provided, you can use custom CSS.

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Color Schemes

The widget includes light and dark themes. Enable dark mode by adding cc--darkmode class to the HTML element. You can also enabled auto dark mode by in the CookieChimp dashboard. This will automatically enable dark mode when the user’s device is set to dark mode.

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CSS Variable Customisation

Develop your own theme by modifying/overriding CSS variables. 
/** Default color-scheme **/
:root {
  --cc-font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji",
    "Segoe UI Symbol";

  --cc-modal-border-radius: 0.5rem;
  --cc-btn-border-radius: 0.4rem;

  --cc-modal-transition-duration: 0.25s;
  --cc-modal-margin: 1rem;

  --cc-link-color: var(--cc-btn-primary-bg);
  --cc-z-index: 2147483647;

  --cc-bg: #ffffff;
  --cc-primary-color: #2c2f31;
  --cc-secondary-color: #5e6266;

  --cc-btn-primary-bg: #30363c;
  --cc-btn-primary-color: #ffffff;
  --cc-btn-primary-border-color: var(--cc-btn-primary-bg);
  --cc-btn-primary-hover-bg: #000000;
  --cc-btn-primary-hover-color: #ffffff;
  --cc-btn-primary-hover-border-color: var(--cc-btn-primary-hover-bg);

  --cc-btn-secondary-bg: #eaeff2;
  --cc-btn-secondary-color: var(--cc-primary-color);
  --cc-btn-secondary-border-color: var(--cc-btn-secondary-bg);
  --cc-btn-secondary-hover-bg: #d4dae0;
  --cc-btn-secondary-hover-color: #000000;
  --cc-btn-secondary-hover-border-color: #d4dae0;

  --cc-separator-border-color: #f0f4f7;

  --cc-toggle-on-bg: var(--cc-btn-primary-bg);
  --cc-toggle-off-bg: #667481;
  --cc-toggle-on-knob-bg: #ffffff;
  --cc-toggle-off-knob-bg: var(--cc-toggle-on-knob-bg);

  --cc-toggle-enabled-icon-color: var(--cc-bg); // yes (v tick)
  --cc-toggle-disabled-icon-color: var(--cc-bg); // no (x tick)

  --cc-toggle-readonly-bg: #d5dee2;
  --cc-toggle-readonly-knob-bg: #fff;
  --cc-toggle-readonly-knob-icon-color: var(--cc-toggle-readonly-bg);

  --cc-section-category-border: var(--cc-cookie-category-block-bg);

  --cc-cookie-category-block-bg: #f0f4f7;
  --cc-cookie-category-block-border: #f0f4f7;
  --cc-cookie-category-block-hover-bg: #e9eff4;
  --cc-cookie-category-block-hover-border: #e9eff4;
  --cc-cookie-category-expanded-block-bg: transparent;
  --cc-cookie-category-expanded-block-hover-bg: #dee4e9;

  --cc-overlay-bg: rgba(0, 0, 0, 0.65);
  --cc-webkit-scrollbar-bg: var(--cc-section-category-border);
  --cc-webkit-scrollbar-hover-bg: var(--cc-btn-primary-hover-bg);

  --cc-footer-bg: var(--cc-btn-secondary-bg);
  --cc-footer-color: var(--cc-secondary-color);
  --cc-footer-border-color: #e4eaed;
}

/** Dark mode color-scheme **/
.cc--darkmode {
  --cc-bg: #161a1c;
  --cc-primary-color: #ebf3f6;
  --cc-secondary-color: #aebbc5;

  --cc-btn-primary-bg: #c2d0e0;
  --cc-btn-primary-color: var(--cc-bg);
  --cc-btn-primary-border-color: var(--cc-btn-primary-bg);
  --cc-btn-primary-hover-bg: #98a7b6;
  --cc-btn-primary-hover-color: #000000;
  --cc-btn-primary-hover-border-color: var(--cc-btn-primary-hover-bg);

  --cc-btn-secondary-bg: #242c31;
  --cc-btn-secondary-color: var(--cc-primary-color);
  --cc-btn-secondary-border-color: var(--cc-btn-secondary-bg);
  --cc-btn-secondary-hover-bg: #353d43;
  --cc-btn-secondary-hover-color: #ffffff;
  --cc-btn-secondary-hover-border-color: var(--cc-btn-secondary-hover-bg);

  --cc-separator-border-color: #222a30;

  --cc-toggle-on-bg: var(--cc-btn-primary-bg);
  --cc-toggle-off-bg: #525f6b;
  --cc-toggle-on-knob-bg: var(--cc-btn-primary-color);
  --cc-toggle-off-knob-bg: var(--cc-btn-primary-color);

  --cc-toggle-enabled-icon-color: var(--cc-btn-primary-color); // yes (v tick)
  --cc-toggle-disabled-icon-color: var(--cc-btn-primary-color); // no (x tick)

  --cc-toggle-readonly-bg: #343e45;
  --cc-toggle-readonly-knob-bg: #5f6b72;
  --cc-toggle-readonly-knob-icon-color: var(--cc-toggle-readonly-bg);

  --cc-section-category-border: #1e2428;

  --cc-cookie-category-block-bg: #1e2428;
  --cc-cookie-category-block-border: var(--cc-section-category-border);
  --cc-cookie-category-block-hover-bg: #242c31;
  --cc-cookie-category-block-hover-border: #232a2f;
  --cc-cookie-category-expanded-block-bg: transparent;
  --cc-cookie-category-expanded-block-hover-bg: var(--cc-toggle-readonly-bg);

  --cc-overlay-bg: rgba(0, 0, 0, 0.65);
  --cc-webkit-scrollbar-bg: var(--cc-section-category-border);
  --cc-webkit-scrollbar-hover-bg: var(--cc-btn-primary-hover-bg);

  --cc-footer-bg: #0c0e0f;
  --cc-footer-color: var(--cc-secondary-color);
  --cc-footer-border-color: #060809;
}

.cc--darkmode #cc-main {
  color-scheme: dark;
}
You can also customise very specific elements by using inspect element in your browser and copying the CSS selector to override the styles.

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Disable transitions

You can disable all transitions simply by setting the transition duration to 0: 
#cc-main {
  --cc-modal-transition-duration: 0;
}