The sepia() CSS function converts the input image to sepia, giving it a warmer, more yellow/brown appearance. Its result is a <filter-function>.
sepia(amount)
amount<number> or a <percentage>. A value of 100% is completely sepia, while a value of 0% leaves the input unchanged. Values between 0% and 100% are linear multipliers on the effect. The lacuna value for interpolation is 0.sepia(0) /* No effect */ sepia(.65) /* 65% sepia */ sepia(100%) /* Completely sepia */
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https://developer.mozilla.org/en-US/docs/Web/CSS/filter-function/sepia