:root {
    /* Square aspect ratio. */
    --slds-g-ratio-square: 1;
    /* Landscape aspect ratio. */
    --slds-g-ratio-landscape: 4/3;
    /* Portrait aspect ratio. */
    --slds-g-ratio-portrait: 3/4;
    /* Widescreen aspect ratio. */
    --slds-g-ratio-wide: 16/9;
    /* Ultra Widescreen aspect ratio. */
    --slds-g-ratio-ultrawide: 18/5;
  }