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.serial-dilution select{appearance:none;min-height:46px;padding-right:34px;background-image:linear-gradient(45deg,transparent 50%,#426c70 50%),linear-gradient(135deg,#426c70 50%,transparent 50%);background-position:calc(100% - 18px) 50%,calc(100% - 13px) 50%;background-size:5px 5px;background-repeat:no-repeat}