jsPsych/.changeset/button-layouts.md

@jspsych/plugin-html-button-response	jspsych
major	patch

Button plugins now support either display: grid or display: flex on the container element that hold the buttons. If the layout is grid, the number of rows and/or columns can be specified. The margin_horizontal and margin_vertical parameters have been removed from the button plugins. If you need control over the button CSS, you can add inline style to the button element using the button_html parameter.

jspsych.css has new layout classes to support this feature.