# Welcome to the Highcharts Maps JS (highmaps) Options Reference

These pages outline the chart configuration options, and the methods and properties of Highcharts objects.

Feel free to search this API through the search bar or the navigation tree in the sidebar.

# yAxis.gridLineColor

Color of the grid lines extending the ticks across the plot area.

In styled mode, the stroke is given in the `.highcharts-grid-line` class.