CSS Reference accent-color align-content aspect-ratio backface-visibility background-attachment background-clip background-color background-image background-origin background-position background-repeat background-size border border-collapse border-spacing border-style border-width box-shadow box-sizing calc() caption-side clip color content empty-cells font-family font-size font-style font-variant font-weight letter-spacing line-height list-style-image list-style-position list-style-type opacity overflow quotes tab-size text-align text-decoration text-indent text-shadow transform white-space word-break word-spacing word-wrap