overleaf/services/web/public/stylesheets/components/input-suggestions.less

.input-suggestions {
	position: relative;
	height: @input-height-base;
}
	.input-suggestions-main {
		position: absolute;
		top: 0;
		background-color: transparent;
	}

	.input-suggestions-shadow {
		background-color: @input-bg;
		padding-top: 4px;
	}
		.input-suggestions-shadow-existing {
			color: transparent;
		}

		.input-suggestions-shadow-suggested {
			color: lighten(@input-color, 25%);
		}