背景

css	style	备注
bg.red	background-color:red;
bgn	background-color:transparent;
bi.to right, #0356fa, #05abff	background-image:linear-gradient(to right, #0356fa, #05abff);
bir.#0356fa,#05abff	background-image:linear-gradient(to right, #0356fa, #05abff);
bil.#0356fa,#05abff	background-image:linear-gradient(to left, #0356fa, #05abff);
bib.#0356fa,#05abff	background-image:linear-gradient(to bottom, #0356fa, #05abff);
bit.#0356fa,#05abff	background-image:linear-gradient(to top, #0356fa, #05abff);
bibl.#0356fa,#05abff	background-image:linear-gradient(to bottom left, #0356fa, #05abff);
bibr.#0356fa,#05abff	background-image:linear-gradient(to bottom right,, #0356fa, #05abff);
bitl.#0356fa,#05abff	background-image:linear-gradient(to top left, #0356fa, #05abff);
bitr.#0356fa,#05abff	background-image:linear-gradient(to top right, #0356fa, #05abff);