You must explicitly import the Layer stylesheet into your application. We recommend importing it in the same file as your root component. 
import '@layerfi/components/index.css'

​
Customization

You can customize the styling of Layer’s React components to match the appearance of your product. There are three ways to do this (ordered from simplest to most control):
  1. Using the theme attribute of LayerProvider,
  2. Setting CSS variables,
  3. Overwriting CSS classes.

​
theme attribute of LayerProvider

The theme attribute allows you to set primary light and dark colors. The component will then use your primary colors to create a cohesive color palette across all components. We won’t add any new colors, just different lightness of your brand colors for accents where helpful, e.g. hover states. 
<LayerProvider
  businessId="..."
  environment="..."
  theme={{
    colors: {
      // Base colors:
      dark: { h: '28', s: '26%', l: '11%' },
      light: { h: '52', s: '100%', l: '55%' },
    },
  }}
>
  {...}
</LayerProvider>
The colors can be defined in HSL, RGB or HEX: 
// HSL:
colors: {
  dark: { h: '28', s: '26%', l: '11%' },
  light: { h: '52', s: '100%', l: '55%' },
},

// RGB:
colors: {
  dark: { r: '36', g: '28', b: '21' },
  light: { r: '255', g: '224', b: '27' },
},

// HEX:
colors: {
  dark: { hex: '#241C15' },
  light: { hex: '#FFE01B' },
},

​
CSS variables

body .Layer__component {
  --color-dark-h: 167;
  --color-dark-s: 38%;
  --color-dark-l: 15%;

  --text-color-primary: #333;
}
The full list of variables is listed in the variables.css file and contains: 
// 1. BASE VARIABLES:
--color-black: #1a1a1a;
--color-white: white;

--color-info-success: hsl(145, 45%, 42%);
--color-info-success-bg: hsl(145, 59%, 86%);
--color-info-success-fg: hsl(145, 63%, 29%);

--color-info-warning: hsl(43, 100%, 44%);
--color-info-warning-bg: hsl(43, 100%, 84%);
--color-info-warning-fg: hsl(43, 88%, 26%);

--color-info-error: hsl(0 76% 50%);
--color-info-error-bg: hsl(0 83% 86%);
--color-info-error-fg: hsl(0 88% 32%);

--color-dark-h: 0;
--color-dark-s: 0%;
--color-dark-l: 7%;
--color-dark: hsl(var(--color-dark-h) var(--color-dark-s) var(--color-dark-l));

--color-light-h: 0;
--color-light-s: 0%;
--color-light-l: 90%;
--color-light: hsl(
  var(--color-light-h) var(--color-light-s) var(--color-light-l)
);

--color-base-0: #fff;
--color-base-50: hsl(var(--color-dark-h) 1% 98%);
--color-base-100: hsl(var(--color-dark-h) 1% 96%);
--color-base-200: hsl(var(--color-dark-h) 1% 94%);
--color-base-300: hsl(var(--color-dark-h) 2% 92%);
--color-base-400: var(--color-light);
--color-base-500: hsl(var(--color-dark-h) 2% 53%);
--color-base-600: hsl(var(--color-dark-h) 7% 40%);
--color-base-700: hsl(var(--color-dark-h) 9% 27%);
--color-base-800: hsl(var(--color-dark-h) 12% 20%);
--color-base-900: var(--color-dark);
--color-base-1000: hsl(var(--color-dark-h) 20% 7%);

--max-component-width: 1408px;

--base-transparent-1: hsla(220, 43%, 11%, 0.01);

--base-transparent-2: hsla(220, 43%, 11%, 0.02);

--base-transparent-4: hsla(
  var(--color-dark-h),
  var(--color-dark-s),
  var(--color-dark-l),
  0.04
);
--base-transparent-5: hsla(
  var(--color-dark-h),
  var(--color-dark-s),
  var(--color-dark-l),
  0.05
);
--base-transparent-6: hsla(
  var(--color-dark-h),
  var(--color-dark-s),
  var(--color-dark-l),
  0.06
);
--base-transparent-8: hsla(
  var(--color-dark-h),
  var(--color-dark-s),
  var(--color-dark-l),
  0.08
);
--base-transparent-10: hsla(
  var(--color-dark-h),
  var(--color-dark-s),
  var(--color-dark-l),
  0.1
);
--base-transparent-12: hsla(
  var(--color-dark-h),
  var(--color-dark-s),
  var(--color-dark-l),
  0.12
);

// 2. BASE CUSTOMIZATION
--color-primary: var(--color-dark);
--color-accent: var(--color-light);
--color-secondary: var(--color-base);
--color-success: var(--color-info-success);
--color-danger: var(--color-info-error);
--color-danger-dark: hsl(349, 30%, 30%);
--color-danger-light: hsla(
  var(--color-info-error-h),
  var(--color-info-error-s),
  var(--color-info-error-l),
  0.4
);
--text-color-primary: var(--color-dark);
--text-color-secondary: var(--color-base-600);
--bg-element-focus: var(--color-base-50);

// 3. EXTENDED CUSTOMIZATION
--font-family: 'InterVariable', 'Inter', sans-serif;
--font-family-numeric: 'InterVariable', 'Inter', sans-serif;
--text-xs: 11px;
--text-sm: 12px;
--text-md: 14px;
--text-lg: 16px;
--text-heading: 24px;
--text-heading-sm: 16px;
--font-weight-normal: 460;
--font-weight-bold: 540;
--spacing-4xs: 2px;
--spacing-3xs: 4px;
--spacing-2xs: 6px;
--spacing-xs: 8px;
--spacing-sm: 12px;
--spacing-md: 16px;
--spacing-lm: 20px;
--spacing-lg: 24px;
--spacing-xl: 32px;
--spacing-2xl: 36px;
--spacing-3xl: 40px;
--spacing-5xl: 52px;
--bg-color: var(--color-white);
--border-color: var(--color-base-200);
--border-radius-4xs: 2px;
--border-radius-3xs: 4px;
--border-radius-2xs: 6px;
--border-radius-xs: 8px;
--border-radius-sm: 12px;
--border-radius: 16px;
--border-radius-5xl: 52px;

--text-color-transaction-credit: var(--color-info-success);
--text-color-varying-amount: var(--color-base-700);

--input-border-radius: var(--border-radius-2xs);
--input-font-size: var(--text-md);
--input-border-color: var(--color-base-300);
--input-placeholder-color: var(--color-base-500);

--label-color: var(--color-base-700);

--btn-font-size: var(--text-md);
--btn-border-radius: var(--border-radius-2xs);
--btn-color: var(--color-black);
--btn-bg-color: var(--color-white);
--btn-color-primary: var(--color-white);
--btn-bg-color-primary: var(--color-black);
--btn-color-hover: var(--color-white);
--btn-bg-color-hover: var(--color-primary);
--btn-color-icon: var(--color-black);
--btn-bg-color-icon: var(--color-base-50);
--btn-color-icon-hover: var(--color-primary);
--btn-bg-color-icon-hover: var(--color-accent);
--btn-secondary-color: var(--color-black);
--btn-secondary-bg-color: var(--color-white);

--badge-color: var(--color-base-900);
--badge-fg-color: var(--color-base-900);
--badge-bg-color: var(--color-base-400);

--badge-color-success: var(--color-info-success);
--badge-fg-color-success: var(--color-info-success-fg);
--badge-bg-color-success: var(--color-info-success-bg);

--badge-color-warning: var(--color-info-warning);
--badge-fg-color-warning: var(--color-info-warning-fg);
--badge-bg-color-warning: var(--color-info-warning-bg);

--badge-color-error: var(--color-info-error);
--badge-fg-color-error: var(--color-info-error-fg);
--badge-bg-color-error: var(--color-info-error-bg);

--badge-border-radius: var(--border-radius-sm);

--table-bg: var(--color-white);

--tooltip-color: var(--color-white);
--tooltip-bg-color: var(--color-base-800);

--bar-color-income: var(--color-base-400);
--bar-color-expenses: var(--color-base-900);

--chart-indicator-color: var(--color-base-700);

​
CSS classes

For fine grained control, you can override specific classes. We recommend using your browser dev tools to find the component you want restyle and overriding that specific class with a higher priority CSS rule. 
body .Layer__table-cell-content {
  background: white;
}

body .Layer__bank-transaction-row .Layer__table-cell-content {
  background: gray;
}