Use sepia() CSS function that converts the input element to sepia, giving it a warmer, more yellow/brown appearance.
filter-sepia-0filter-sepia-5filter-sepia-10filter-sepia-20filter-sepia-25filter-sepia-30filter-sepia-40filter-sepia-50filter-sepia-60filter-sepia-70filter-sepia-75filter-sepia-80filter-sepia-90filter-sepia-95filter-sepia-100