Module:etymon/styles.css

.etytree {
	width: max-content;
    max-width: 100%;
    overflow: hidden;
    box-sizing: border-box;
}

/* remove scrollbar on mobile */
body.skin-minerva .etytree {
	min-width: min-content;
}

/* set to 100% on narrow screens */
@media screen and (max-width: 719px) {
	body.skin-minerva .etytree {
		width: 100%;
	}
	body.skin-minerva .etytree .NavHead > div {
		width: unset !important;
	}
}