Notes/packages/ckeditor5-math/theme/mathform.css

.ck.ck-math-form {
	display: flex;
	align-items: flex-start;
	flex-direction: row;
	flex-wrap: nowrap;
	padding: var(--ck-spacing-standard);

	@media screen and (max-width: 600px) {
		flex-wrap: wrap;

		& .ck-math-view {
			flex-basis: 100%;

			& .ck-labeled-view {
				flex-basis: 100%;
			}

			& .ck-label {
				flex-basis: 100%;
			}
		}

		& .ck-button {
			flex-basis: 50%;
		}
	}
}

.ck-math-tex.ck-placeholder::before {
	display: none !important;
}

.ck.ck-toolbar-container {
	z-index: calc(var(--ck-z-panel) + 2);
}