Function that generates a pseudo-random HSL color

generateAccentColor.sol

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity >=0.8.19;

/// @notice Generates a pseudo-random HSL color by hashing together the `chainid`, the `sablier` address,
/// and the `streamId`. This will be used as the accent color for the SVG.
function generateAccentColor(address sablier, uint256 streamId) internal view returns (string memory) {
    uint256 chainId = block.chainid;
    uint32 bitField = uint32(uint256(keccak256(abi.encodePacked(chainId, sablier, streamId))));
    unchecked {
        uint256 hue = (bitField >> 16) % 360;
        uint256 saturation = ((bitField >> 8) & 0xFF) % 80 + 20;
        uint256 lightness = (bitField & 0xFF) % 70 + 30;
        return string.concat("hsl(", hue.toString(), ",", saturation.toString(), "%,", lightness.toString(), "%)");
    }
}